Top similar games like Space Defense Grid:
Space Defense Grid $5.99
Multiple levels, multiple weapons and enemies have their own characteristics, waiting for players to challenge.
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十字防守(X Defense: Timing TD)$2.99
Strategy, timing and fortune: Novel and immersive tower defense game experience!
MarZ: Tactical Base Defense$21.99
Build your defense base to fight back the undead hordes of Mars and secure the future of the red planet. MarZ is a game of strategy and tactical defense where you must carefully manage your crew and resources as you try to uncover the terrible secrets of the undead.
Electromaze Tower Defense$3.99
Electromaze Defense is a classic tower defense game where you create your own maze. With a wide variety of maps, towers and upgrades, Electromaze Defense will keep you hooked for hours on end! Can you build the perfect maze?
Sciware Defense$0.99
A 3D FPS/TPS Tower Defence game in a sci-fi world, defend your base from corrupted robots and unlock better turrets
Escape Gaia$9.99
you will play as Gaia, the shattered will of a planet, and command your spaceship to explore new worlds, collect and refine various resources, build a home on the damaged spacecraft, summon a wide range of monsters, and ultimately, devour other shattered wills to repair yourself.
Mercury Fallen$24.99
A sci-fi colony management sim with a focus on exploration, expansion, and survival. Rebuild your underground facility, manage colonists and robots, and uncover the mysteries of an alien world light-years from Earth. Dig deep, expand across the surface, and shape your new home.
Mars or Die!$19.99
Control two characters simultaneously! Survive, gather, collect upgrades, fight all sizes of one-eyed Martians, build defensible outposts and conquer Mars, in this glorious mix between roguelite and tower defense.
ViSP - Virtual Space Port$14.99
ViSP – Virtual Space Port is a creative building game for VR. Construct your own space port out of blocks and defend it against relentless enemies to fortify your space colony!
Element$11.99
Element is a realtime strategy space game for people who don't have time to play realtime strategy space games. Generate energy, mine element, build attack and defence units, and destroy the enemy while maintaining a balance between earth, air and water.
Astronaut Assault$9.99
Dive into Astronaut Assault, a third-person Sci-Fi tower defense game, and battle against relentless enemy waves in diverse arena settings. Arm yourself with an array of turrets, traps, and gadgets to halt, hinder, and outmaneuver your foes.
Raging Titan$4.99
Build your towers, plan your efforts, watch out for changing paths and strike back against the alien invaders in this challenging tower defense game!
Battle for the Droid Station$0.99
Battle For The Droid Station is a RPG shooting game now available on Steam. Feel the adrenaline as you run and gun down hundreds of rogue mechs and droids causing mayhem on the space station. Take control of your droid character and try to clear the space station from invading droids and robots.
Arms Evolution: ZOMBIE DESTROYER$5.99
"Arms Evolution: ZOMBIE DESTROYER" is a unique Roguelite tower defense game. You will slaughter thousands of zombies in the game and enhance your weapon towers through build character in the RPG way. and , the game also offers an idle mode, so you can enjoy building weapons anytime and anywhere.
Geometry Defense: Infinite$9.99
Geometry Defense: Infinite is a classic infinite tower defense game where you must build a maze to slow enemies and build towers to destroy them. An action-packed and engaging game requiring focus to take on challenges and test your skill.
Mineral Defense$14.99
Mineral Defense combines tower defense with roguelite elements and procedural generation. Build paths, unlock upgrades, and unleash powerful synergies to conquer evolving challenges in an ever-expanding world.
星旅：前奏 Wandering Planet: Prelude$3.99
Star Trek: Prelude is a space-based game that builds defense towers on earth to defend against alien invaders called Black Ember.
Cartonfall: Fortress - Defend Cardboard Castle$4.99
Build your own cardboard fort and defend it against swarms of enemies. Gather resources, craft weapons and set traps. Be creative, improvise and experiment to win.
银河战争一(Galactic Wars One）$1.6
A tower defense strategy science fiction game, in the future era, when aliens invade the solar system, players need to build various turrets to resist alien attacks and guard the Milky Way and solar system.
Project Astra Dominium$9.99
Project Astra Dominium is a Tower Defense game with Basebuilding and Automation elements. Build up your base to become a supply hub for Earth's desperately needed materials, gather resources while defending against an unknown alien threat and improve your tower's and AI capabilities.
Asteroid Core$0.99
You are isolated on a small meteor and need to build a fire to escape before being destroyed by aliens. Use your limited space to create machines and obtain more and more resources. Enjoy this mix of puzzles, tower defense and incremental gameplay.
Galactic Garrison$6.99
Galactic Garrison is a sci-fi, turn-based tower defense game where you defend your base from relentless alien waves on Mars. Deploy soldiers, build barricades, and upgrade defenses to withstand attacks. Earn powerful reward cards to gain strategic advantages and outmaneuver your enemies.
Taur$24.99
Taur is an action-strategy sci-fi game. Control the Prime Cannon and unlock all of its powerful weapons and abilities. Build turrets, droids, aircraft and more as you fight to protect the homeworld of the Tauron droids against a relentless invasion. Will your Taur stand against the Imperion warmachine?
Block Strategy$10.99
Block Strategy is an RTS Base Defence roguelite with a fully destructible world. Build your base and find fuel to power your reactor before you're overrun by an onslaught of enemy robots.
Stacks:Space!FREE
Stacks:Space is a space-themed base builder card game with rogue-like elements. Buy booster packs to get new cards, discover craft recipes by stacking cards together, create structures, manufacture drones and droids, defend your base from enemies, visit distant planets, and more!
Planetary Annihilation: TITANS$29.99
Wage war across entire solar systems with massive armies at your command. Annihilate enemy forces with world-shattering TITAN-class units, and demolish planets with massive super weapons!
Project VTS$4.99
Project VTS is a real-time TD game. You'll need to build your defence around your base and defend against different enemies from all directions in various terrains of the alien planet.Use your turrets, obstacles, power supply, resource facillities to defend your base.
Tep The Destroyer TDFREE
TEP the destroyer is a single player tower defense game where you will face alien monsters and ships in ground and space battles! Your strategy will decide the fate of your people in a sci-fi environment of varying difficulties!
Fate of the World$9.99
Fate of the World is a dramatic global strategy game that puts all our futures in your hands. The game features a dramatic set of scenarios based on the latest science covering the next two centuries. You must manage a balancing act of protecting the Earth’s resources and climate versus the needs of an ever-growing world population, who...
Lazy Galaxy 2$7.99
Lazy Galaxy 2 is an idle/clicker game with base-building and RTS elements. Lead an evil (albeit lazy) alien race to conquer the universe! Expand your base, fight vicious foes, and conquer the galaxies. Acquire combat experience and convert into candy, the most precious alien resource!
Automatrons - Tower Defense$3.99
Join our machine legion to conquer the world.
Glory to the Robots!$9.99
A game in the genre of management strategy. Here you can build your own factory for the production of robots, and on another planet, and extract resources and test robots on other different planets.
Final Fort$3.99
FinalFort is a survival game with defense as the core gameplay, and when the end comes, you use the last human shelter to constantly dig minerals, build walls and various turrets to defend against the endless zombie army.
Tomb Of AnuBI0S$9.99
Tomb of AnuBI0S is an unique 2D tower defense-platformer with an Egyptian Sci-fi setting. Defend the AI deity RAm from waves of undead "Organics." Upgrade your arsenal from weapons to walls, turrets, and your player capabilities. Immerse yourself in meticulously crafted levels and defend RAm!
主动防御(Active Defense)$0.99
This is a strategy tower defense game where players need to choose the appropriate defense towers based on different maps and enemies. The game also offers a variety of defense towers, maps, and an endless mode waiting to be unlocked by the players!
BlackChain$4.99
A classic single-player RTS set in a Solar System ruled by megacorporations. Journey from Mars all the way to Planet 9 and uncover the secrets of the BlackChain.
The Last Starship$24.99
The Last Starship is a 2D space construction game where you design and upgrade your starship. Choose your path: pirate hunter, miner, engineer, spacebus driver, and more, whilst exploring vibrant star systems. Enjoy a growing sandbox world, with regular free updates. Your cosmic adventure awaits!
TowerDefenceDesigner$0.99
A self-built level tower defense game where you compete with friends and online players to see whose creativity is more popular. You control the game content, design the difficulty level, come create your own tower defense game!
Cosmic Parkour: Infinite Journey$1.99
Your archnemesis has taken your invention and has sent you to another realm. This game features 40 levels of parkour packed fun where in each of them, the player must simply find an exit and pray that they exit this hell. More levels are added with game updates!
Home Domes$14.99
Explore this life sim on a new planet. Create your new home on the rugged surface of Mars during the early days of colonization inside the safety of your new Dome. Everyday life on a new planet has new challenges and more difficulties of surviving out on the Domestead.
Planet Factory$0.99
A small quick game about building a factory to launch planets into a solar system! Grow your base and increase production to make the ultimate factory for launching planets!
Engineered To Purpose$9.99
Engineered to Purpose is a new tower defence game where you custom-design towers to defend your base, with millions of builds to explore and refine. Set in the far future, E2P's story of posthumanism, family, and change will open new worlds to explore and survive.
Pew Pew Rocket!$0.99
Guitar hero meets Galactica, This is not your average space shooter. This one is special.
Scrap Games$4.99
Scrap Games is a 3D side-scrolling beat'em up game with a simple gameplay system that offers many possibilities. Choose your robot character, upgrade it and go through the next stages by defeating your enemies. Prepare yourself and let the fight begin!!! Beat them up!!!
Overheat$4.99
Overheat is a hard sidescrolling platformer in which a robot only needs to climb up one level to return to its home planet. How hard can that be?
sea fight$0.99
"Naval Battle" is a simple game. Players control submarines and fire torpedoes to attack the enemy. By upgrading the base and obtaining modules in battles, players can become powerful quickly. Have a great time playing!
魔方谏言FREE
A 3D-styled puzzle-solving burning brain indie game, using the Pocket Cube to restore objects. A story about AI's journey to recreate the history of human science
Androsystem Idle$1.99
Produce Androids and create a Fleet that will help you conquer new planets. Mine valuable minerals that will further increase your production capacity.
Space Break$1.99
Build ships from elements and go to fight. The player can control several different spaceships at the same time (fleet battles). During the battle you can switch ships and different ships can attack different opponents. Choose your ships and tactics for each battle.
Ryzer: The Reflectors Path$0.99
In another normal day of his job as a space engineer, Ryzer is going to fix a space prison ship and things don't go his way. In Ryzer: The Reflectors Path, help Ryzer find the best path through the reflectors in this futuristic puzzle and finally just complete his job.
String Rush$1.99
String Rush is a puzzle-platformer where you don't control your avatar in real time, but you have to enter the movement commands (input) inside a string and execute them all together.