Top similar games like Empyrean Frontier:
Empyrean Frontier $11.99
Empyrean Frontier is an epic real time strategy game that mixes classic RTS gameplay with a multi-stage campaign in which the player commands a fleet of ships through a galactic map. Boss battles, base building, planet destroying superweapons, and tactical skirmishes create a unique blend of genres.
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Revenge of the Titans$19.99
The ultimate mash-up of Real-time Strategy and Tower Defense!

Infested Planet$14.99
Command a team of 5 elite soldiers against an alien horde of 100,000. Surrounded on all sides, you must outmaneuver and outsmart the enemy.

Mars or Die!$19.99
Control two characters simultaneously! Survive, gather, collect upgrades, fight all sizes of one-eyed Martians, build defensible outposts and conquer Mars, in this glorious mix between roguelite and tower defense.

Nuke Them All$19.99
An RTS classic reborn with a twist. Time is of the essence, Commander! Capture the flags, conquer the territories, and eliminate the enemy fort. And finally, nuke them all! This old-school sci-fi Indie real time strategy game, crafted by devoted team, revives the genre's enduring allure.

Zero-KFREE
With 100+ truly unique units, Zero-K is an RTS of freedom and creativity, tempered by a decade of refinement. Sculpt land into a castle and throw invaders off it with a Jugglenaut. Explore a massive campaign, solo or co-op. Hop online for epic 32 player battles or fast paced 1v1, on 100s of maps.

Space Haven$22.99
Embark on a space voyage with your ragtag crew of civilians in search of a new home. Build spaceships tile by tile, create optimal gas conditions, manage the needs and moods of their crew, encounter other space-faring groups, and explore the universe in this spaceship colony simulation.

Re-Legion$9.99
Become The Prophet in a world of the future without the future! Lead your Cult in this cyberpunk RTS in the fight against evil corporations and heretics. Choose your creed, convert citizens, create an army and take over the city!

Neon Marble RustFREE
Classic RTS: control hordes of arena-bots before a stadium crowd. Neon, Marble, and Rust are the 3 factions, each has their own exotic resources that you must command your units to craft. Units are built in batches, so if you play fast you can build massive armies and dominate the competition.

Hypergate$11.99
Hypergate is an arcade-style space combat game. It is focused on fast-paced combat rather than resources, realistic flight, or grinding. It features a 2-hour campaign, LAN or single-player Instant Action for customizing your own battles, 30 upgrades to buy using in-game points, and 3 ships to fly.

Skirmish Line$9.99
Experience the brutality and randomness of war as an Allied tactical commander in the Pacific Theater during World War 2. Train, equip, and command a squad of soldiers as you fight against the fanatical Imperial Japanese Empire.

Call to Arms$14.99
Call to Arms offers an innovative mix of real-time strategy and 3rd, as well as 1st person controls. Set in the time of modern warfare, the game offers realistically modeled vehicles and heavy weaponry. Command your troops to victory or fight by yourself in the 3rd or 1st person action mode.

Void Destroyer 2$9.99
Start with nothing... End with everything! All you have is a basic ship, barely fit for combat, with it you'll start your journey and empire. A open world space sandbox, inspired by and expanding the classics.

Planets Under Attack$11.99
Play as humans or robots in a brand new sci-fi strategy adventure! Travel into the far reaches of space, through cleverly designed star constellations and variable game modes, conquering enemy planets using 15 combinable technologies.

DG2: Defense Grid 2$14.99
Setting the bar as the definitive tower defense game, Defense Grid 2 introduces new worlds and threats to test your tower placement strategies. With a bold new look and the addition of new game modes, player-versus-player and multiplayer co-op, every play brings fun new opportunities and challenges.

AI Olympius$12.99
Join the rebels in a third-person shooter with RPG elements and base-building mode. Fight against various combat drone models under the control of the supreme AI.

Astral Ooze$7.99
Astral Ooze is a sci-fi realtime strategy game. Your astral ooze generates over time for every controlled star. Expand your astral ooze and conquer the stars!

Oxygen Not Included$24.99
Oxygen Not Included is a space-colony simulation game. Deep inside an alien space rock your industrious crew will need to master science, overcome strange new lifeforms, and harness incredible space tech to survive, and possibly, thrive.

Haunted Tower: Tower Defense$3.99
👻 A clever tower defense game about Strategy, not Gems. Place towers to prepare your defenses and use abilities to battle waves of ghosts rising from the grave.

Worbital$12.99
With the shifting gravity on your side, aim your cannons, blast your enemies and enjoy the fireworks. Worbital is a real-time strategic artillery game in space, peppered with a heavy dose of cosmic chaos. The goal: be the last civilization standing!

Orbital Shipyards$9.99
Build, Explore, Fight. Build a ship of your imagination, explore the vast cosmos, and fight for your stake in the galaxy.

Conflicks - Revolutionary Space Battles$6.99
Spaceships, lasers, and… chickens! What more could you ask for?Conflicks: Revolutionary Space Battles is a creative new take on space-themed videogames that merges the deep, thoughtful gameplay of strategy games with the intuitive accessibility of physics-based games.

Glory to the Robots!$9.99
A game in the genre of management strategy. Here you can build your own factory for the production of robots, and on another planet, and extract resources and test robots on other different planets.

Skylight$14.99
Skylight is a turn-based tactics game of colossal space battles, with VR and non-VR versions. Command nimble squadrons of fighters, specialized frigates, and giant capital ships as you orchestrate your forces toward victory.

SunAge: Battle for Elysium$14.99
A return to the roots of real-time strategy, providing beautiful 2D visuals combined with all the features that we came to expect from old school classics. This remastered version is a culmination of all the improvements and new features based upon suggestions from the community.

Space Engineers$19.99
Space Engineers is a sandbox game about engineering, construction, exploration and survival in space and on planets. Players build space ships, space stations, planetary outposts of various sizes and uses, pilot ships and travel through space to explore planets and gather resources to survive.

Zenith Armada$9.99
Embark on interstellar conquest in a 2D space strategy game. Command ships, explore galaxies, engage in real-time battles, and customize your fleet. Traverse hazardous star maps, unlock factions, and strategize for victory. Are you ready to conquer the cosmos?

Quantum Gravity$5.99
Get ready for intense space combat in Quantum Gravity! Invert gravity to soar through space, engaging in long-range and melee battles against a variety of enemies. With four game modes, including Infinity Mode and multiplayer PvP, there's never a dull moment in this action-packed bullet hell game!

Gewevo : Interstellar$11.99
Gewevo : Interstallar is a space strategy game derived from the tabletop RPG universe Gewevo. It offers an approach a little closer to a wargame with regard to the empire management aspect. Made with passion by a one-man team;)

WARSHIFT$9.99
Unique mix of Action, RTS and RPG gameplay elements that forms an innovative game genre. You can build base, manage troops, and then come down to keep your enemy at gunpoint in the dynamic battle and customize your main characters.

BossConstructor$14.99
Scavenge modules, combine them in the deadliest and most efficient ways imaginable, and fly your very own spaceship through alien space with BossConstructor. Thousands of procedurally generated galaxies await you and your space-faring collection of assembled modules to explore them.

Calrivar ClusterFREE
An Accessibility First Real Time Strategy Game, built from the ground up to work with only one hand and limited sight. Entirely single player all movement and control is preformed via keyboard, the camera system was designed around the physical layout of the number pad on keyboards.

Galactic Dominion$4.99
Galactic Dominion is a fast paced 4x space strategy game. Explore the stars, perform research, manage your colonies, build a fleet, defend your systems, and conquer the galaxy. Play through an epic story driven campaign or alternatively customize your games for countless re-playability!

Spirit Oath$0.99
Rebuild the world tile by tile and create patterns to summon units to your command, as masses of enemies attack your core. Cast spells to assist your troops in battle, and don't stop until total annihilation of the enemy.

Defense Grid: The Awakening$9.99
Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base.

Hyperdrive HorizonFREE
Hyperdrive Horizon is a high-speed space racer where you’ll dodge obstacles, collect boosts, and challenge advanced AI on dynamic tracks.

Invasion: Phoenix$10.99
Invasion: Phoenix is a passion project by a solo developer and lifelong gamer. An alien empire hellbent on conquering Earth has arrived at our doorstep, and humanity is in total anarchy. Delve into this meticulously crafted 2D top-down pixel art RTS and sign up to reclaim Earth!

Nexus Defenders$4.99
Tower Defense meets a Visual Novel narrative. Place an arsenal of towers to halt the invading enemy. Use special abilities such as napalm strikes, EMP blasts, and orbital lasers. A sci-fi space drama, filled with dialogue choices.

Zeta Leporis RTS$4.99
A sci-fi real-time strategy game. An existential war among asteroids in classic RTS style. Build and defend, produce and upgrade, attack and annihilate!

Robowars$3.99
Robowars is back on Steam! Fight off troops of droids for freedom and honor in our classical tower defense game. Lead the forces of the Solar Union to protect the peaceful planet of Praymos from the aggressive Trade Confederation.

BLAST-AXIS$20.0
Expel extra-dimensional invaders from Phobos with hot lead & high explosives. Boost & kick your wrecking drone to extreme speeds on every axis. Explore the cavernous Phobean moon complex, salvage powerful weapons & blast away the uninvited guests in: BLAST-AXIS: PHOBEAN TERROR.

Ad Astra: Sci-Fi Tower Defense$4.99
Lose yourself in an indie solo-dev. treasure that harkens back to arcade classics! All while thumping along to killer retro-inspired beats by Ovani sound. Embark on an epic tower defense adventure against awe-inspiring machine monstrosities, made by a devoted gamer for devoted gamers.

Door Kickers 2: Task Force North$24.99
Command military Special Ops Teams in gripping tactical combat against a Middle East-based terrorist network. Sequel to RockPaperShotgun's "Best Tactics Game of 2014".

Stacks:Space!FREE
Stacks:Space is a space-themed base builder card game with rogue-like elements. Buy booster packs to get new cards, discover craft recipes by stacking cards together, create structures, manufacture drones and droids, defend your base from enemies, visit distant planets, and more!

Aven Colony$29.99
Build a new home for humanity in Aven Colony. Discover Aven Prime - an alien planet of deserts, tundras, and wetlands light years from earth. Build your colonies into massive, sprawling cities whilst dealing with the challenges faced when settling on a new world.

Geometry Defense: Infinite$9.99
Geometry Defense: Infinite is a classic infinite tower defense game where you must build a maze to slow enemies and build towers to destroy them. An action-packed and engaging game requiring focus to take on challenges and test your skill.

Starlight: Defence Command$5.99
Take the role of a Defence Commander and protect UPF assets remotely through the use of your Adaptable Nano Tablet in this immersive, PC focused Tower Defence Game. It's designed to be a tough but rewarding experience with character progression and the ability to configure towers to your own liking.

Anomaly: Warzone Earth$9.99
Lead an armored squad through the perils of this reversed tower defense action-strategy game!

Battlevoid: Harbinger$9.99
Battlevoid: Harbinger is a hard sci-fi space exploration game blending roguelike, turn-based, star map strategy, and real-time space battles. You are a young commander venturing out into enemy territories, to unknown galaxies, never knowing what you will face as you jump out from hyperspace.

Sipho$17.99
Sipho is an action survival game with an intricate building system. Grow your own creature and take over the local ecosystem. Fight, grow, survive, dominate. Play in adventure or sandbox mode.

Angle of Attack$9.99
Angle Of Attack is the aerial combat action companion title to All Aspect Warfare. It features high-octane air combat against air, land and sea threats over vast planetary regions. See the action from a different perspective and get in on the action!

Absolute Territory$9.99
Engage in futuristic space dogfights against large warships and enemy starfighters. Manage Newtonian flight physics and power settings, outwit and eliminate hostiles, and survive through hazardous mine and asteroid fields. Gripping action across the campaign and leaderboard game modes.