Games like Planets Under Attack on Steam
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Ascent - The Space Game
Ascent is a PVE sandbox space MMO with 270 BILLION star systems and an emphasis on strong Sci Fi. It encourages Exploration, Colonization, Research, Asteroid mining, Farming, Trading, and Combat. Outside the tutorial sector, everything in-game has been built by players.
Interstellar Space: Genesis
Interstellar Space: Genesis is a turn-based space 4X strategy game in which you attempt to build a thriving galactic empire. Discover mysteries among the stars, colonize worlds, and engage enemies in tactical turn-based combat on your journey to becoming the ruler of the galaxy!
Space Rogue
Take on the role of a spaceship captain. Explore new worlds, and engage in intense ship-to-ship battles. Develop unique battle tactics, upgrade your ship, and recruit crew members as you fight for peace or piracy.
Defend The Highlands
Defend the Highlands combines the genres of Tower Defence, Real Time Strategy, and Scotland. The player will have to build defences, recruit Scotsmen and manage their porridge stockpile as they fight off the British invasion of Scotland.
EarthX
EarthX is a rocket company management game. Go from launching small rockets on Earth to eventually building a colony on Mars. Create your own Internet constellation, develop new technologies, supply the International Space Station and terraform Mars!
8-Bit Invaders!
8-Bit Invaders! is a fast-paced, retro Real-Time Strategy game for the PC. Control the military might of the Galactic Marine Corps or Invade with the devastating power of the Cranioids! Mine, Build, and Fight your way to victory! Conquering the Multiverse was never so easy.
FTL: Faster Than Light
This "spaceship simulation roguelike-like" allows you to take your ship and crew on an adventure through a randomly generated galaxy filled with glory and bitter defeat.
Dungeon Warfare 2
Become a dungeon lord to defend your dungeons with the deadliest of traps and insidious contraptions against greedy adventurers and wannabe heroes.
Achievement Clicker 2018
Feel like a real Achievement hunter! Earn Achievements, upgrades and get the most Achievements on Steam!
异常 | Exception
Exception is a game about AI programming. During the game, the player assists the units to defeat their enemies in the virtual world. However, the player needs to control the units by programming instead of controlling them directly.
Imperium Galactica II
Reintroducing a classic from the golden era of gaming, the original empire building space RTS, Imperium Galactica 2 is back and looking better than ever with new high-res textures and vivid colors.
Tower Wars
Tower Wars combines elements of tower defense, RTS, and all-out multi-player mayhem to bring you a completely unique experience, delivered with a fun and funny not-so-old world style!
Master of Orion
The ascendant spacefaring 4X strategy game returns! A new chapter in the epic Master of Orion saga is poised to once again capture the imaginations of millions of gamers.
Journey of Greed
This is a perfect hybrid of social board game and strategy card game. Steal, set traps, assassinate, escape, mind games... Compete online with three other players at each adventure and use every mean possible to gain the most coins.
8-Bit Armies
8-Bit Armies is a retro Real-Time Strategy game. With a colorful, blocky voxel art style, 8-Bit Armies is Petroglyph's most fast-paced, friendly, and accessible RTS game to date. Featuring a campaign of 25 single-player missions, 12 co-op missions, multiplayer and skirmish modes.
Battlepillars Gold Edition
Battlepillars is a real-time tug-of-war strategy game in which you command caterpillars armed to the teeth with flamethrowers, sticky honey, mines, machine guns, and more!
Lux Delux
Lux Delux is a fast-paced turn-based-strategy game of risk and world domination, with so much more! Highly moddable, Lux has over 900 maps, diverse random map generators, a biohazard mode, an AI SDK, and an online multi-player league.
Codex of Victory
In this sci-fi turn-based strategy with real-time base-building elements, you’ll be defending human territories against the transhuman Augments. Expand your HQ, and manufacture and upgrade an army of advanced drones to wage interplanetary war for Humanity!
Celestial Command
Mine asteroids, salvage space debris, design your own small or massive spacecraft using individual functional components, complete missions, and engage in battles against enemies in a vast galaxy with realistic physics based on orbital mechanics or in a classic physics mode.
Out There: Ω Edition
Out There is an award-winning space exploration game blending roguelike, resource management and interactive fiction.
OBEY
OBEY is an asymmetrical multiplayer game. In many games you send commands to teammates or AI units. In OBEY you command your (human) opponents, or are commanded by them. Players are always free to obey/disobey. And everyone deals with the consequences of their own decisions.
Zombie Tycoon 2: Brainhov's Revenge
Pick your faction, Monster, strategy, and find out who gets to become King of the Undead!
Battlefleet Gothic: Armada 2
Battlefleet Gothic: Armada 2 is the new real-time strategy game adapted from Games Workshop’s famous tabletop game that portrays the epic space battles of the Warhammer 40,000 universe.
Red Planet Farming
Become the first Agricultural Director of Mars in Red Planet Farming! This casual strategy game tasks players with producing enough food to feed a growing population of settlers on the red planet.
Sid Meier's Alpha Centauri™ Planetary Pack
Sid Meier's Alpha Centauri™ Planetary Pack includes the original Alpha Centauri and the expansion, Alien Crossfire.
Battlevoid: Harbinger
Battlevoid: Harbinger is a hard sci-fi space exploration game blending roguelike, turn-based, star map strategy, and real-time space battles. You are a young commander venturing out into enemy territories, to unknown galaxies, never knowing what you will face as you jump out from hyperspace.
Town of Salem
Inspired by the party games Werewolf and Mafia, Town of Salem is a game of murder, mystery and deception.
Sins of a Solar Empire II
Battle for galactic dominance in this real-time 4X strategy game with unrivaled scale! You’ll explore, expand, exploit, and exterminate through military force, diplomacy, trade, culture, influence, and other underhanded tactics.
Cosmochoria
A tiny, naked cosmonaut with a jetpack & laser blaster must revive a dying galaxy by planting one seed at a time. An innovative and addictive arcade adventure experience with mystery and intrigue in all the right places.
Defense Zone 3 Ultra HD
The sequel to the hit strategy game, with new weapons, landscapes, and options.
Space Pirates and Zombies
Explore a randomly generated Galaxy populated with factions, enemies, missions, and items providing you with a unique experience each time you play.
Survivor Squad
Survivor Squad is a Strategy Action game where you control a Squad of up to four survivors and guide them through a highly randomized world looking for supplies to aid you on your journey.