Top similar games like Planet Extincter:

A unique mix of RTS and Action: take control of a powerful combat mech, build your base, raise an army, and fight alongside your forces on the battlefield.

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. 

Hell of Men: Blood Brothers is a real-time strategy game, developed by one person, in which you will have to collect resources, build your base, train your army by choosing your soldiers wisely and fight.

Prime Domination is a real-time strategy game where you build your base, manage finance, produce powerful military units, and battle against AI or other players in large-scale multiplayer matches with up to 10 commanders.

Get ready to protect the entire solar system from an unprecedented threat - the D'Ahari, a race of insect-like aliens. Control an entire fleet of spaceships, trade with other races of an Alliance, and develop your own space station.

Comet Force is a Space Arena Shooter Action Roguelite. Build your camp, recruit to compose and grow your troop, collect upgrades and unique effects, fight enemies and bosses, and choose how the threat evolves. Keep your troop strong enough to survive all waves and close off the anomaly.

Defend galaxy against Alien invasion in the RTS offline game with roguelike fun

Your homeworld was destroyed by The Zardians an alien species, and you are the sole survivor. Your missions? Making them pay.

A top-down tactical tank game focused on vision, positioning and battlefield awareness. See first — or be destroyed.

You are in command of the human fleet, searching for asteroids to mine, extract resources and build bases and more ships to defeat aliens invaders. This simple and short action RTS has a full and exciting campaign, and a skirmish mode that allows you to play a different mission on every match.

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. *

For centuries, the mysterious depths of space, full of secrets, have awakened in each of us the desire for exploration. In SPACE SAGA, you can fulfill your dream of becoming a real space explorer and embark on an exciting adventure, laden with peril and enigma.

Enter the chaotic world of Exo Helljumper: Descent X, filled with mutated foes and lurking dangers. Combine items and strategy to conquer relentless levels. Face unique foes and formidable bosses, test your cunning and skills, and feel the thrill of battle as you push beyond your limits!

Sci-fi RTS and Top-Down

Sanctum Arcadia is a game where you must fight your way through increasingly dangerous zones filled with enemies, hazards, and mystery. Sanctum Arcadia has a unique but still familiar progression system, challenging and engaging combat, all in a smooth Arcade-like experience.

Step into Cosmic Mart, the space supermarket where the deal of the day is certain death. Wipe out the relentless alien infestation devouring the facility in this frantic action roguelike. Choose your mercenary and survive long enough to reach the sixth floor.

Grey Galactic is a real time strategy game in space where you build up your planets and ships to conquer your enemies. Develop your empire and fleet of spaceships to destroy your enemies and take over the galaxy! Do you have what it takes to become the best Fleet Captain the UFMC has ever seen?

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.

Protect the base from an alien invasion. Place cannons and destroy the invaders. Upgrade cannons to resist the enemies.

Consume the civilization of the fools who unleashed you upon the universe. Become the Empire Ender.

Play VALKKRYES : Ashes Of War , Your tribe has suffered a devastating attack - the elders were killed, the lands and orchards burned to ashes, and many of your brothers were kidnapped by the perpetrators. But amidst the chaos, a hero emerged - you.

Co-op twin-stick base building survival game.

Grimstar is a real-time strategy game with a story-based single-player campaign. Your brother's sudden death has hit you hard, but the laws of the corporation for which he laid down his life dictate that you must take his place until his contract is fulfilled...

A Roguelite strategy tower defense game. Different towers, events, and upgrades every run. Manage resources, fight alongside your towers, and defend the Dimension Core.

Defend your planet against the Space Invaders. Build your defences against lovecraftian spacecrafts. Keep your health up and you might even become an invader yourself! Warning: this game contains flashing images that may make it unsuitable for people with photosensitive epilepsy.

The Reverend's Pathis a rogue-lite game where players craft killer moves using Gu insects, within a combat system of Sea of Consciousness, Thought, Dao Marks, Body, Energy, battlefield, space, and time.

A 3D Sci-Fi space shooter game where you fight against big flagships and bases to unlock the secrets of the world.

U.P.C. is a top-down shooter where you play as a fearless exterminator to solve a small bug problem at a nuclear research facility. With the rogue-lite elements, you must choose your path to the upper floors carefully, while trying to bug fixing in the facility.

Final Orbit is a roguelike space adventure where you travel from planet to planet, upgrade your ship, and battle through relentless enemies in your quest to defeat the boss on Planet 10.

Tanks Etc. is a modern reimagining of co-op overhead arcade classics; it offers classic gameplay while adding in depths of strategy to keep players reinventing strategies for waging war with their friends.

Fast-paced space RTS with 10-25 minute matches. Command fleets, conquer systems, or research the Singularity. Simple controls, strategic depth, but no 3-hour commitments required.

Everything moves when you do in Enter the Chronosphere, the turn-based roguelike. Each chronosphere is procedurally generated with defenders and biomes from the worlds it has consumed. Break in, find exotic weaponry and gadgets, outsmart hostile aliens, and fight your way to the core.

Castle Rain is a 3D top-down action game where you control Billy, a mushroom whose island was devastated by a villain who turned his friends and everyone around into manipulated zombies.