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.

Sci-fi fleet shooter: drag to fly, build your mothership, conquer the galaxy. Assemble a fleet, form a battle formation, and wage war.

Build your base, command your army, and wage real-time PvP war on a living conquest map. Clear a frontier of monsters and alien UFOs, join a faction, team up with friends, and climb the seasonal ranks. A classic base-building RTS with modern military firepower, ad-free on desktop.

Loop Defense is a single-player sci-fi tower defense game. Build enemy routes with base walls, assemble a modular defense, manage limited loadouts, energy, and research, face armored, flying, carrier, and wall-breaker units across a star map, or challenge Endless Mode.

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.

A real-time strategy game of orbital warfare. Build satellites, launch them into chosen orbits, and fight for control of the sky. Your assets stay invisible until an enemy sensor finds them. Every strike depends on being overhead at the right moment.

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.

Build ships block by block, command your fleet in real-time space battles, and choose your path through a roguelike campaign. Upgrade your ships, watch them break apart in combat, and uncover what happened to the galaxy around you.

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!

Explore by day. Survive the night. Ember Legion is a lightweight strategy game with roguelite and tower defense elements, where every dawn is a chance to retake what the horde just took.

Build powerful defenses, collect loot, combine effects, and survive evolving waves from the void in a tower defense game driven by ARPG-inspired buildcrafting and persistent progression.

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?

Get aboard the Ghost Train and fight with 99 lives worth of hardship to forge your own destiny with the unnatural grasp of KalshwK Desert : Top-Down 2d Roguelite Shooter

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.

One bathroom break doomed you to work forever. Recruit employee clones, merge them into stronger coworkers, build your ever-growing office train, collect powerful ID badges, and escape the endless corporate death loop.

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.

Explore the remains of a dead god as an AI trying to find your way back to your crew. Scavenge equipment, recruit allies and face powerful foes in this sci-fi roguelike adventure.

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.

They buried the truth. The invasion did not end. Now it is coming home. Grave Orbit is a dark sci-fi survival campaign of relentless escalation, impossible odds, and a war that grows far beyond anything humanity was prepared to face.

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...