Top similar games like Raid on Area 51:
Raid on Area 51 $4.99
Over a million people are storming Area 51! Defend the base and shoot'em all before they see them aliens!
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GRAV$19.99
GRAV is a sand box experience where you explore a multitude of planets, hunt strange alien creatures, build and defend outposts, craft weapons and armor, and attempt to survive against other players in a hostile environment.
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.
Beyond Contact$19.99
A fiercely formidable sci-fi survival game, set on a hostile alien world that wants you dead! Alone, or with a crew, do you have what it takes to survive?
CelestialFREE
Celestial is an Open world Space survival game playing on a Spherical world of roughly 700km2. Survive in a hostile environment with a variety of roaming creatures. explore ancient ruins of an alien civilization, learn their technologies and use them to find a way back home.
Gun Blaze$5.99
Gun Blaze is dynamic online arena fights in the far future setting. Be a sniper, an engineer or a stormtrooper. Fight against other players, capture the enemy base, control heavy vehicles and score points to take place in the global table of records.
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.
Cyberoque$4.99
The game takes place in 2215. Suddenly terrible news has come from the outskirts of the solar system: our civilization was attacked by the alien armies. A terrible war begins, humanity is surrounded, enemy space ships press the earth's army.
Galactic Garrison$6.99
Galactic Garrison is a sci-fi, turn-based tower defense game where you defend your base from relentless alien waves on Mars. Deploy soldiers, build barricades, and upgrade defenses to withstand attacks. Earn powerful reward cards to gain strategic advantages and outmaneuver your enemies.
Marsmare: Alienation$1.99
Marsmare: Alienation is a thrilling adventure of an earthling kidnapped by malevolent aliens. Improve your gear and gain new abilities as you progress through the game. Encounter numerous enemies such as Martians, robotic spiders, space slugs and flying drones.
Robots In The Wild$9.99
Robots In The Wild is a challenging puzzle/strategy game about creatively dropping Blocks to build Robot fortresses. Travel to distant planets and construct huge, interconnected Robot strongholds to protect and rescue the HEARTS from the Monsters of the Wild.
Operation: Harsh DoorstopFREE
Operation: Harsh Doorstop is the ultimate, free to play, tactical shooter sandbox. Play singleplayer, multiplayer, or co-op modes and explore thousands of community-created maps, weapons, and vehicles via the Steam Workshop. Created by ex-developers of Squad, Red Orchestra, and Insurgency.
Triton Survival$14.99
Triton Survival is an open world survival game about exploration, construction, engineering, and fighting on planets. Embark on this interstellar adventure and conquer the galaxy. Are you ready?
Roboplant$11.99
In a future not too far away, humans are finally able to harvest food on alien planets. Embark on a new journey with your team of robots called Beebop 179. Build and manage a hydroponic farm, grow delicious plants and survive the mysterious challenges of outer space.
Project VTS$4.99
Project VTS is a real-time TD game. You'll need to build your defence around your base and defend against different enemies from all directions in various terrains of the alien planet.Use your turrets, obstacles, power supply, resource facillities to defend your base.
Isomer$9.99
Isomer is an isometric strategy game inspired by classic turn based games from the 90s and many other more recent survival titles. It's open ended, sandbox and each world is procedurally generated leading to an almost unlimited number of different worlds to explore, mine, loot and conquer.
Lazy Galaxy$4.99
Lazy Galaxy is a mix between RTS and idle/clicker game. Lead an evil (albeit lazy) alien race to conquer the universe!
Wandering Star$0.99
You are a team of researchers going to explore a planet for possible colonization. Unexpected storms have crashed your ship and you are now stranded on the planet's surface. Pick your class from 4, each with their own skills and abilities. Search out for parts to help repair the ship and escape this planet.
Marble Skies$9.99
Marble Skies is a fast paced 3D-platformer where you control your marble through various levels and try to get the best time for each one. Complete all the levels in your own time, or challenge your friends to get on top of the leaderboards!
They Can't Stop All Of UsFREE
D.A.B. Your foes in co-op & PvP battles. (D)efend bases with weapons and skill. (A)ttack with clever AI armies. (B)uild amazingly creative defenses.
Bit Odyssey$4.99
Encounter alien races and exotic locations as you travel in an endlessly procedurally generated galaxy. No two game are the same. As you explore, randomly generated “Episodes” will have you fighting hostile ships, helping aliens and exploring the surface of new planets.
Fractal ChickenFREE
Explore, craft, fight, and build your way through multiple infinite voxel worlds, look at fractals, have a good time! Play multiple game modes, builld automated machines, chop trees, build a base, turn into a helicopter, upgrade weapons and equipment and more! Oh, and most importantly, awaken true fractal power!
Epic Transport$4.99
Epic Transport is a casual pixel style transport sim inspired by OpenTTD. Unlike other transport sims in this game you start from the most basic form of transport, a walker, and go all the way up to alien spacecrafts. Finally a way to remove those pesky cows.
Abatron$19.99
Abatron is a multiplayer action strategy shooter. It's galactic dominance with controlled combat. First build your base and troops in Commander mode. Then jump into any unit at any time in First Person or in Third Person mode and confront your enemy head on.
GearStorm - Armored Survival$11.99
GearStorm - Armored Survival is a story-driven, open-world sci-fi survival adventure. Discover what led to the Phage, a deadly virus apocalypse and our escape to a alien world. Explore a vast alien planet, build your base, create your colony, acquire vehicles, weapons, and supplies to defend it.
Maia$24.99
Maia is a colony building game set in the not-so-distant future. Your colonists make planetfall on a hostile world and you must ensure their survival and their safety, constructing their off-world habitat from almost nothing and sheltering them from a dangerous, often deadly environment.
Huge Bang Bang$3.99
Huge Bang Bang Tv-Show is gathering the best Adryssis’ warriors. Create your avatars, enter the arena with your friends and join 4 versus 4 action/platforming fights.
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.
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!
Unclaimed World$16.99
Manage interstellar pioneers and their descendants in this detailed sci-fi colony sim. Centuries after planetfall, colonists are still struggling to gain foothold on their lush and alien planet. You settle on the frontier by carefully managing resources, production and different personalities.
Cepheus Protocol$19.99
Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue Civilian Combatants . There’s nobody else coming, it’s up to you now.
Exotic Matter$19.99
A blend of Metroidvania adventure and procedural survival game, in Exotic Matter you will explore, craft, fight, solve puzzles and survive. As the sole survivor of a last-ditch expedition to an alien planet, your duty is to find a powerful alien material that could save Earth from destruction.
Mind The AbyssFREE
Mind the Abyss is a fast-paced movement shooter that combines fourth-dimensional abilities and ever-evolving weaponry within an alien planet.
Kingdoms Rise and Fall$14.99
Kingdoms Rise and Fall is a captivating Real-Time Strategy game that takes you on an epic journey through different eras, spanning the entirety of history and beyond! Kingdoms Rise & Fall focuses more on culture, science, and keeping your nation happy over time.
黑暗塔 (The Dark Tower)$0.99
This is a maze exploration game that combines Bomberman and Roguelike elements. Players will be accompanied by a tank, pass through various obstacles in the Dark Tower, experience soul-like battles, and try to bring the Dark Tower back to light!
MurnatanFREE
Humans VS Aliens FPS shooter combined with RTS.
Level Zero: Extraction$19.99
Tactical extraction shooter meets immersive survival horror. Play as rival mercenaries fighting for loot, or as alien monsters hunting humans from the shadows. Solo or with friends, experience this unique dark take on asymmetrical PvPvE multiplayer.
DEATH RATION: BACK TO 19XX$19.99
At DeathRation, we don't cut trees or dig stones. You have a set lifespan time [EMIT], and to increase this time, you must either take it from someone else or help someone to share it with you. You spend your time serving your community and defending your last hope, the Tower, from alien attack.
Drox Operative 2$19.99
Drox Operative 2 is a starship action RPG with warring alien races, fierce space battles, a dynamic, evolving galaxy, and co-op multiplayer for Windows and Linux.
SpaceBourne$14.99
Spacebourne is an open space exploration game with Rpg elements. Its world consists of different factions at war. You as an expert pilot need to choose your side or be on no one's side and create a force of your own. Load up your weapons, Ready your ship and warp to adventure.
We must survive$7.99
A combination of Procedural generated planets and events, is intended to give us some incline to the vast array of planets that await us in the void.
Nelo$4.99
Nelo is the lightning fast, out of this world, genre-blending, bullet-hell, character-action epic meticulously crafted by the loving couple at Magic & Mirrors.
Boundless$19.99
Shape your citizen, forge your destiny and sculpt your world in this epic voxel sandbox MMO built on endless possibility.
Railgunners$2.99
Railgunners is a shooter built to highly customizable difficulty levels. Fight your way through hundreds of enemy ships, and help humanity fight back against the alien invasion!
Steam Marines 2$24.99
Steam Marines 2 leaves you in charge of the I.S.S. Delhi, ready to take back your space station.
Into the Stars$19.99
Take the role of Captain in this Space Survival Simulation as you explore a massive star system in search of a new home for humanity. Outfit your ship, hand pick your crew and set off on a journey through an open-world where you must scavenge resources, shelter civilians and outrun a hostile alien force.
Alien Mayhem$9.99
Alien Mayhem is an artificial open world sandbox game developed and created by Supa Serious. We simulate a what-if scenario where an alien prankster finds himself in a virtual game world that enables him to prank in a rather unconventional yet stylish way.
War of Gaia : Into the Fire$9.99
War of Gaia: Into the Fire is a Sci-Fi Survival game where you gather resources, build bases, create and join factions, go to war over scarce resources, find and salvage tech, customize your armor and weapons, and discover the hidden mysteries of the uncharted planet you are stranded on.
2023: Alien Bugs Invade EarthFREE
Why are alien insectoids invading Earth in 2023? This narrative driven 2D shooter pits you against a seemingly hopeless battle against the invading Insectoids. How will you (and Earth) manage to survive? What hidden technological, historical, and spiritual secrets will you discover as a result?
Zombaliens$15.99
Kill aliens in creative ways in this wacky retro FPS featuring non linear, highly interactive maps. Zombaliens blends retro FPS with immersive sim, letting you use anything in your environment against your enemies, while retaining the speed and simplicity of a retro FPS.
Volcan Defend the Tower$14.99
A solo development and the first game of Processor Game Studios presents "VOLCAN defend the Tower". A third person shooter on an open world sci-fi game, play as Sollum to defend your Volcan Towers against your enemies while exploring a planet earth with nature restored
Gods and Nemesis: of Ghosts from DragonsFREE
Explore the bizarre alien land as described in the book Gods and Nemesis: Leviathan Seed. Additional chapters will be added allowing you to advance your character and support a growing universe.