Top similar games like Planet Extincter:

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. 

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.

Space Tales is an epic space opera that delivers the tactical complexity of classic RTS gameplay within a universe where ancient horrors lurk beyond the stars. Follow Xander's journey from a loyal Inter-Planetary Expansion (IPE) soldier to a champion who uncovers the darkest secrets of the cosmos.

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

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.

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

4X-RTS in space, 10–25 min games. Conquer every system or research the Singularity and ascend.”

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. *

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!

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.

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.

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.

Drone Sector is a futuristic gunship game. Provide close air support by firing variety of weapons at the enemies and guide your allied troops via commands. Keep your troops alive, complete objectives, collect resources and recruit engineers. Research better weaponry for the gunship and the troops.

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...

Classic RTS gameplay fused with a modern roguelite. Shape your build each run by assembling an evolving arsenal of powerful units and facilities. Harvest resources, build out your base. Raise your army and call down orbital strikes to overcome the forces threatening your survival.

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.

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

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.

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.

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.

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.

Cyberwinter is an isometric action strategy game. On a distant planet with a harsh climate, you have to fight legions of dangerous monsters for a new home for humanity. Build bases, develop and defend them.

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.

Destination Unknown is a fast-paced single-player spaceship shooter with exploration in space galaxies, RPG elements, mini-games, mining, and crafting. Experience an adventure through a randomly generated universe filled with an exciting sci-fi story full of secrets, quests, and more.

UFO Blast is a fast-paced space shooter that combines the thrill of classic arcade games with modern, responsive controls and vibrant neon visuals. Easy to pick up, but challenging to master—Are you ready for the ultimate blast?

Bull3000VRTS: Multiplayer VR RTS inspired by classics like C&C! Command modern tanks, futuristic aliens, robots, augmented forces, and human troops in thrilling 1v1 or 2v2 battles across epic desert battlegrounds. Gather friends, deploy your ultimate strategy, and dominate immersive combat!

Prepare for the climactic finale as Montenegro returns for one last mission. Use your stealth skills to rescue your beloved daughter, Merche, and unravel the trilogy's thrilling conclusion amidst intense action and suspenseful gameplay!