Top similar games like Unearthing Invasions:

A classic tower defense game set in space! Build and upgrade towers, defend your portal from waves of alien invaders, and outsmart evolving threats across handcrafted and procedural maps.

Solar Defense is a Military Sci-Fi inspired Tower Defense game focused heavily on strategy and decision making. Defend key locations and repel the Pilakarr forces back to their home world to end their attack and bring an end to this war.

Star Jet Alpha is a top-down space shooter inspired by classic arcade games. Progress through each stage by blowing up enemy space stations while avoiding or destroying enemy missiles, space mines and asteroids. Unlock Star Jet capabilities by completing stages.

The Echoes of Mars is a voxel-style tower defence game. Defend your research base on Mars from ancient creatures by strategically placing towers and using advanced tech.

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. *

4 turrets, a ship in peril, and waves of enemies. Hold the line and defend the ship, robot.

Get Off My Space! is a tower defense game where you rely on skillful tower placement and resource management to beat upcoming dangers of the galaxy. Combining strategy and micro-managing fire groups, you will overcome the hardest level objectives.

Asteroids are headed directly towards Earth. Destroy asteroids before they can slam into Earth. Earn medallions to purchase ship upgrades to help in the fight to save Earth.

A retro space shooter with a twist - now you can rotate your ship and aim diagonally at enemies, adding a whole new dimension to the shoot 'em up genre.

Retro-inspired arcade-style shooter. Save humanity from incoming waves of flaming hot meteors, alien ships hell-bent on destroying humanity, and the strangeness of space by shooting, blasting and nuking incoming waves of meteors and enemies.

A top-down arena shooting light Roguelike game. Players take on the role of a modified warrior who is caught up in a black hole and forced to land on an unknown planet. Faced with hordes of alien monsters and uncontrollable mechanical debris

Outlast the onslaught in a sci-fi survivors-like where your decisions matter as much as your firepower. Command customizable starships, enhance your arsenal with 100+ strategy-defining upgrades, and annihilate endless fleets of cosmic combatants! Carve your legacy among the stars and die trying!

Sixty basic cores, hundreds of base station equipment, and thousands of chips, you can freely cooperate and shoot through the dual-angle joystick operation in a survival Roguelike game! Explore the sci-fi space and build your strongest battleship!

A fast paced garden defense game. Collect what you can before the pests take over!

Customize your Gun Bots to fight through 7 unique worlds with different weather conditions that become more challenging as you progress.

Cosmic Tank is a modern take on the classic game Asteroids. Mine your way to riches! Fight off hostile threats! Upgrade your ship and rent a few helpful drones! Survive epic boss fights!

Fusion of Vampire Survivors Like and Tower Defense! Survive with Towers against waves of enemies. Build towers by day, survive endless enemy waves by night. Expand your territory, gain experience, and grow stronger with each battle. How long can you survive?

Solitarius is a 2D top-down wave shooter set in a sci-fi space environment. It is a free minigame that contains six different levels, eight different enemies and nine different weapons. Instead of surviving as long as possible you have to make it through each level.

Build your towers according to the enmey you are facing in the wave. Upgrade your turrets to increase range, damage or rewards. Each enemy wave will be random and increases in speed and damage resistance. How far can you go!

Gather a squad and fight for survival in We're All Going To Die. Work together with a squad using abilities, equipment and exploring different levels to make the most of your fight against your demise, after all, you're all going to die at some point.

Protecting Us From Incredibly Worrisome Extremely Hostile Oddities...is what you will be doing with your football! Defend the Earth from the invading disciples of the Deranged Octopus, and learn the ultimate secret of the Universe.

Celestial Wardens is a sci-fi tower defense game where you command a lone spaceship to defend a planet under siege. Survive waves of enemies, build turrets, upgrade your ship, and manage your planet to prevent total annihilation.

Arcade Forever is a 3D vertical space shooter. This is an action game in which many enemies, obstacles and different weapons guarantee great fun. If you like fast space action, this is the game for you.

Beware Planet Earth! is a beguiling mix of classic tower defense and time management coming to PC via Steam for the first time. Save your cows from the Martian invasion by building an effective defense using towers, traps and objects, and also by firing your Zapper directly at the invading force of little green men!

Oh no! Anxiety Bot has found himself in a meteor field! Try to help him survive as long as possible in this cozy, laid back arcade shooter. How long can you keep him safe?

Year 2425, humanity colonized the exoplanet named SACH-041840. But then, in the 55th year "they" came; No one knows who or what controls them, but what is known is that if they reach the colony proper, it will be annihilated. It is up to you to bring the WRECKONING upon them!

Frantic 4-player laser ricocheting top-down shooter. Keep it casual and enjoy the chaos, or master the surprisingly deep mechanics to obliterate your enemies. Duke it out locally in free-for-all or 2v2.

Defend your base on Mars from invaders in Residuum. A thrilling mix of tower defense and shooter gameplay, upgrade weapons and choose your crew for a unique experience each time. Play with a friend for even more excitement!

Hyper Frenzy is a free arena-styled singleplayer 2D space shooter using top-down perspective. Fight in different modes against bots, collect various items and use one of the plenty weapons to defeat your opponents. Create your own maps and gametypes.

A wave-based action game, where you fight to survive for as long as you can.

Dodge, collect, and survive. Every piece of salvage you grab makes your ship deadlier and tougher.

This is a game in the rougelike genre. Where you'll control your character through challenging, dramatic battles. The game offers many character customization features such as character upgrades, weapon upgrades, equipment systems, support drone systems.

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.

In Deadline: Aphelion, you play as a mercenary tasked with defending the research facility from the hordes of alien spiders that have been drawn to it. 

Your chicken has been kidnapped, and that’s all it takes to send a retired astronaut into full galactic mayhem. Space Bross is a hand-drawn 2.5D tower defense & action roguelite where you’ll build bases, fend off alien hordes, and blast your way across planets to bring your feathery friend back.