Top similar games like Alien Earth:

Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required. *

A relaxing strategy game featuring unconventional gameplay. Your objectives include development, evolution, border expansion and protection of your hive.

Halo: Spartan Strike makes you a Spartan supersoldier battling evil forces. Delve into 30 challenging missions through cities and jungles using a devastating arsenal of weapons, abilities and vehicles including the iconic Warthog against the Covenant and Promethean enemies. *DirectX feature level 10 required*

Network E.L.E.™ is an open-world, survival story set on Planet Mercury in 2184, an abandoned city — military base filled with deadly radiation. You play as Myorah, a NASA exploration pilot going after four Mercury-980 single board Space-VPX chips, which activate a dormant spaceship left within the city.

Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.

The replicator robots are back! It's 2528. The machines are increasingly infecting the planets with genetically modified monsters. Challenge them and try to stop the onslaught. Upgrade buildings and heroes, mine resources, discover technology and fight to save humanity!

Venineth is a single-player game focusing on unraveling the mysteries of ancient alien technology, somewhere in the universe via exploration, platforming, and puzzle-solving, in a dangerous, distant worlds.

SpyHack is a tactical action game where you play as male or female ATD Agent stealthily sneaking past guards or dispatching them with various weapons. Walk your way through the levels, hack various devices and terminals to reveal rooms. Get rid of guards and take control over hacked contraptions.

LA Cops is a fast, action packed 3D top down shooter set to a theme of 70s Cops in LA trying to do a tough job in a tough town.

A world of Dwarves, Elves, Humans and Orcs. Mounted in the crowns of each race's king are four scattered shards of the Watcher's Tower Gem, which must be returned to its rightful place before the world degenerates into oblivion. Conquer all four races with the army you assemble and lead into battle.

It’s 2013… Holy “Siege” banner of The Chief Soldier has been moved to eternal world to welcome soldiers of future in ascendant future. Delivered his last masterpiece, named after him, perfectly on the day he died, and this perfection brought immortality.

You love animals and additionally have a messiah complex? Noah is a game for you! Single-handedly build an Ark, gather all the wildlife and protect it from the wicked! Thanks to a coop mode of up to 4 players you can save the world together! Remember to hurry or this will be your last deadline.

Take over a disfunctional Waste Management Facility on a distant planet. Build incinerators, recyclers, robots, turrets, and more. Battle vicious creatures on the planet's surface with powerful weapons!

Plumb the depths of a doomed leviathan on a mission to save a dying solar system. Unravel a mystery that could alter the fate of humanity. Created with Adventure Forge, this showcases the power of the no-code tool that lets you craft your own narrative-rich experiences.

Survive in a city controlled by a game corporation. Residents have to buy DLC for every unfinished product, developers are forced to make endless sequels, and lootboxes are now sold even at the grocery store. Stop the madness or join it in the cybernetic stealth-shooter Geeksos.

Deep Sixed is a roguelike space sim that will force you to use strategy, ingenuity and duct tape to keep your ship (and your skull) in one piece as you risk exploring a mysterious nebula protected by dangerous alien creatures.

Project Hortus is a city-building strategy game set in a distant future, after Earth has been destroyed. On the planet Hortus Prime, it's up to you to establish a new civilization. Manage your city, explore uncharted territories, and face unknown dangers.

This is the story about the beginning of the conquest of outer space by earthlings. It began as a global idea of saving mankind from hunger and lack of resources, and ended as a brutal and merciless war in space far from Earth.

The year is 1962 and the Cold War has the nation gripped by fear.  A top-secret government unit called The Bureau begins investigating a series of mysterious attacks by an enemy more powerful than communism.

Feel the inhuman tension of outer space - floating between bits of debris - struggling to conserve air and fuel - experiencing a hauntingly personal tragedy.

These damned people have been reigning in our part of space for too long. They kidnap our people and conduct experiments on them. We cannot afford to be treated like this.

Super Sanctum TD is a retro-styled Tower Defense game that focuses on strategy, customization and replayability. Build advanced mazes and construct powerful towers to prevent alien hordes from reaching the Core!

Future Weapon 2D is a top down space shooter where you can relive the couch co-op glory days with up to 8 players across 2 screens. Grab a gun, grab a spaceship, upgrade everything, mine rocks, explore, and recruit the local townsfolk to conquer this demo.

Mech Chip is an action-adventure platformer with pilotable machinery. Explore the internal labyrinth of the cybersphere, and install yourself into devices to gain new quirks and abilities.

An awesome adventure to hunt treasures, explore the islands and defeat the dark side.

Taur is an action-strategy sci-fi game. Control the Prime Cannon and unlock all of its powerful weapons and abilities. Build turrets, droids, aircraft and more as you fight to protect the homeworld of the Tauron droids against a relentless invasion. Will your Taur stand against the Imperion warmachine?