Top similar games like Particle Fleet: Emergence:
Particle Fleet: Emergence $14.99
Build and design your own fleets and stand opposed to the Particulate in this physics/strategy/RTS/fleet hybrid. Build partially destructible and self repairing ships that interact with enemies less controlled by some scripted logic and more driven by a real time massive physics particle simulation.
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Crimson Connect Origin$5.99
Survive, collector's heroes!! game is a fusion genre of real-time strategy and roguelike. Survive to the end through defense-style battles

Voidship: The Long Journey$10.99
Design your battleship and fight your way through unforgiving space. This is a tale of a lone spaceship on a centuries-long mission. As the captain, you´ll make strategic decisions, explore unknown sectors, meet allies and enemies, gather resources, technology and crew. To battle stations!

Cosmic Invasion$4.99
Cosmic Invasion is a combination of strategy mixed in with quick frantic battles against fleets that contain many ships. The strategic layer is a 20 X 30 grid with 600 sectors. Move your ships around to protect your home planet and space stations from the invading fleets of UFO ships.

Infinifactory$24.99
Infinifactory is a sandbox puzzle game by Zachtronics, the creators of SpaceChem and Infiniminer. Build factories that assemble products for your alien overlords, and try not to die in the process.

8-Bit Armies$14.99
8-Bit Armies is a retro Real-Time Strategy game. With a colorful, blocky voxel art style, 8-Bit Armies is Petroglyph's most fast-paced, friendly, and accessible RTS game to date. Featuring a campaign of 25 single-player missions, 12 co-op missions, multiplayer and skirmish modes.

Halcyon 6: Starbase Commander$14.99
Halcyon 6: Starbase Commander is a retro space strategy RPG with base building, deep tactical combat, crew management and emergent storytelling.

RimWorld$34.99
A sci-fi colony sim driven by an intelligent AI storyteller. Generates stories by simulating psychology, ecology, gunplay, melee combat, climate, biomes, diplomacy, interpersonal relationships, art, medicine, trade, and more.

RIOT: Civil Unrest$16.99
As civil crisis deepens and inequality tears the very fabric of society the discontentment of the masses manifests itself in violent public disturbances and civil disorder. Play as the police or the angry horde as RIOT – Civil Unrest places you in some of the world’s most fractious disputes.

Entangled$0.99
Entangled is a physics puzzle game revolving around grappling gun mechanics. You are immersed in a colorful environment while being entranced by a relaxing space ambient soundtrack. It is challenging, but extremely rewarding.

3rd Invasion - Zombies vs. Steel$4.99
In this real-time strategy game with a hint of RISK, you'll command sizable armies. Erect a formidable base capable of withstanding enemy assaults. Will you build your army behind impenetrable defenses, primed for a massive assault? Or perhaps you favor small, swift strike teams.

Uncharted Space - project 3062$59.99
In this game, you are a leader, leading a force of army to fight other forces in the deep spaces. You will plunder their resources, build your homelands, explore and expand, managing your army both strategically and tactically. This will be a saga written with blood and fire.

绛河之上 Under Supernova$7.99
An instant strategy science fiction simulation survival sandbox game. Players can control individuals, teams, and manage multiple bases. Players can farm, build, excavate, fight, produce, graze, explore, trade, record and pass on knowledge, and can also fly a spaceship to explore the starry sky.

ZaciSa: Defense of the Crayon Dimension!$4.99
2D Tower Defense game set in a colorful world of Crayons. Over 20 different Maps with plenty of fun Weapons at your ready to defend the Crayon Empire. Can you survive the onslaught?

Lethis - Path of Progress$19.99
Lethis - Path of Progress is a city-builder in a victorian steampunk setting.

Tortuga City$7.99
Survive Tortuga City as a wanted turtle. Defend yourself against the police, build a rebellion, endure dynamic weather, and find an escape route within 50 days before the police deploy their secret weapon.

Cortex Command$19.99
Choose between different factions, with their own set of expendable soldiers, mechas, and weapons. Protect your brain, mine gold, and destroy the enemy cortex in his bunker complex!

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.

Rotten Tide$5.99
Rotten Tide is a horizontal 2D tower defense game where players must protect the world from the attacks of all kinds of monsters who are threatening the humans in big cities all around the world.

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.

Farlanders$14.99
Terraform, strategize, and construct a Martian colony in this retro-inspired turn-based city builder. Create a comfortable living for your citizens, research alien artifacts, and uncover the secrets of the Red Planet.

Lazy Galaxy 2$7.99
Lazy Galaxy 2 is an idle/clicker game with base-building and RTS elements. Lead an evil (albeit lazy) alien race to conquer the universe! Expand your base, fight vicious foes, and conquer the galaxies. Acquire combat experience and convert into candy, the most precious alien resource!

Skeleton Scramble Deluxe$2.99
Skeleton Scramble Deluxe is a fast-paced, head-to-head real-time strategy game. Play as a necromancer, summon an army of relentless skeleton warriors, and frantically build a gauntlet of turrets to hold off your opponent's forces.

Advisors at the End of the Universe$4.99
AEU is a fast paced realtime strategy and 4x hybrid. Players influence their empire to grow, fight, forge alliances or engage in trade. Players are given control over the empire's traits, research and a set of three types of abilities(Construction, Plagues and Agents) to accomplish their goals.

Wait! Life is beautiful!$4.99
W!LiB! is an interactive psychological thriller about suicide, based on personal experience. This is a story about a void in the soul, about search and loss of the life purpose in trying to save oneself and others. This is a life that can be lived your own way. For any life is beautiful... isn’t it?

Chaos Sector 混沌宙域$9.99
It's a retro-style strategy game, you can choose the Northsky Fleet or the Pirates, lead your commanders, controll many kinds of warships and robots, and fight a war with the enemy's fleet and alien horde on the galactic chessboard!

Planetary Defense: An Orbital Turret Defense System$1.99
2D space shooter and turret defense come together to create the Planetary Defense System this world needs! Shoot down asteroids and aliens and survive the bosses in this arcade like game featuring customizable satellites, projectiles, and upgradable Cannon and Planet Shield systems.

The Ramen Sensei$8.99
Build the ultimate bowl to leap past your ramen rivals and achieve greatness!

Firebase Defence$3.99
Firebase Defence is a new spin on the traditional tower defence gameplay. You have to defend yourself from the waves upon waves of incoming enemies. You are free to build, place and manage your available resources and units in any way you want. But failing to balance those will result in defeat!

Stellar Monarch$14.99
Asymmetric space empire builder where you feel like the Emperor, not a logistics officer. No micromanagement, grand scale, fast paced, audiences, assassins, imperial court, disloyal admirals.

End War RTS$2.99
Inspired by modern science fiction! A modern real-time war game, the screen is in the style of realism, the fast-paced attack effect is easy to fatigue, easy to use and simple to operate, mainly in the traditional style

Into the Breach$14.99
Control powerful mechs from the future to defeat an alien threat. Each attempt to save the world presents a new randomly generated challenge in this turn-based strategy game.

DARK FACETS$9.99
Dark facets is a 2d strategy action game in the tower defense genre with the unusual mechanics and a unique storyline. In the role of a dark magician, you will have to build your own citadel, mine resources and engage in battle with a dangerous enemy.

Human Defense [RTS]$1.99
The earth was invaded by aliens, and human beings resisted alien species and deduced the most meticulous battle outcome with the simplest control method

Neural Shock$5.99
In Neural Shock, you must cleanse the world of horrid and bloodthirsty creatures by utilizing turrets, traps, wits and weapons. Choose from different class choices with unique playstyles and over 20+ different turrets and traps in this unique sci-fi Tower Defense / Action RPG.

Terminal squad: Swarmites$3.99
Terminal squad: swarmites is a game with indirect control where you must erect a chain of buildings, which generate resources for construction or the combat units for destruction of an enemy.

Space Cheese Defenders$3.99
A tower defense game with RTS elements about gathering cheese in space, where mobile carriers are able to deploy smaller spacecraft. Collect cheese to buy and upgrade spaceships and use each type to customize your playstyle and defend your base!

TowerDefenceDesigner$0.99
A self-built level tower defense game where you compete with friends and online players to see whose creativity is more popular. You control the game content, design the difficulty level, come create your own tower defense game!

Box Nation [] Lets Go Build and Fight$199.99
Box Nation [ ] is a sandbox kind of game. In this box world, you can become a leader of your own nation. Your main goal in the game is to create and develop your nation of boxes.

星旅:前奏 Wandering Planet: Prelude$3.99
Star Trek: Prelude is a space-based game that builds defense towers on earth to defend against alien invaders called Black Ember.

Planet Barren Objective$2.99
Fight, upgrade, explore, and build your way out of a dangerous planet in this 2D pixel art side scroller. Stream of foes will keep you on your toes while beating them will reward you with much needed resources.

Alien Planet Survival$7.99
You drift in space, land on a random planet, collect materials, survive, develop civilization technology, conquer more planets, idle automation factory game

Off Course ELEMENTS of SPACE$9.99
2d pixel art, top down sci- fi space ship building, resource management simulation with some arcade, tower defense elements. You build spaceship, collect necessary resources and defend yourself against waves of enemies. Equip ship with: rockets, life support, electric system and weapons.

Cursed Treasure 2$4.99
Why be good when you can be... bad? Cursed Treasure 2 is an addictive tower-defense game that puts the power of darkness at your fingertips. Build towers of powerful orcs, demons, and undead, and master powerful spells, to protect your precious hoard from all manner of no-good do-gooders.

Super Galaxy Squadron EX Turbo$9.99
Super Galaxy Squadron is a fast-paced vertical shooter designed for human beings as well as SHMUP veterans. Featuring multiple game modes, a challenging but merciful difficulty curve, forgiving health system, and SEVENTEEN playable ships.

Hover Attack$17.99
Hover Attack, the definitive version of the robot action game that became a huge hit in 1984 and was ported to various consoles, is now available on STEAM with a port of the original game and an Ultimate Evolution version that dramatically evolves the gameplay with enhanced graphics and sound!

Defense of Roman Britain$6.99
Tower defense Game to safeguard the land of Rome.

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.

Planet Factory$0.99
A small quick game about building a factory to launch planets into a solar system! Grow your base and increase production to make the ultimate factory for launching planets!

Tooth and Tail$19.99
Lead the revolution with an army of flamethrowing Boars, mustard gas-lobbing Skunks, and paratrooper-puking Owls. Tooth and Tail is a Real-Time-Strategy game featuring Single Player, Online Competitive Play, Split Screen, Replays, and more. Build a base, lead your army, eat your enemies!

Radiant Defense$9.99
MILLIONS OF ALIENS WILL DIE!Radiant Defense is a tower defense game set in a vibrant universe invaded by countless alien hordes.Build your space fortress any way you wish, set up wide variety of weapons and traps and let the invasions begin!

IstrolidFREE
In Istrolid you design your own unique spaceships from a large number of parts to fit your strategy and play style. With no set units or factions you are free to create a fleet where each ship has its own balanced strengths and weaknesses, from basic fighters and bombers to hulking battleships and speedy destroyers.