Top similar games like Celestial Wardens:

Hexfall is a planet-scale tower defense game where over 100,000 enemies attack at once. Mine the crust, wire the power and arm a hex world against an armada that fills the sky long before it comes down.

A strategic and action-packed base survival game where you mine crystals, build units, and defend your base against waves of UFOs. Defeat enemies, gather resources, and unlock new planets to expand your defenses. Are you ready to conquer the galaxy?

Get Off My Space! is a tower defense game where you rely on skillful tower placement and resource management to beat upcoming dangers of the galaxy. Combining strategy and micro-managing fire groups, you will overcome the hardest level objectives.

Take over a disfunctional Waste Management Facility on a distant planet. Build incinerators, recyclers, robots, turrets, and more. Battle vicious creatures on the planet's surface with powerful weapons!

Rise of Mutant Swarms is a strategy survival tower-defense game where you defend the base against waves of evolving mutant enemies. Place and upgrade turrets, adapt to enemy abilities, and make critical decisions as the pressure rises with every wave.

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!

Escape From The Red Planet simplifies resource management, tower defence, and first-person mechanics into a singular arcade experience. On the latest mission to Mars, the Orion III crash-landed. With Martian attacks looming, Houston most definitely has a problem!

Desperate Place is a strategic tower defense game where you play as a crew member who wakes up early on a damaged colonization starship. Stranded on an unknown planet, you must gather resources, repair the ship, and defend against alien monsters to survive and escape.

Land on an untouched planet and build a factory colony that reaches the stars. Harvest, haul and produce without conveyor belts, launch rockets to orbit and the Moon, wake your colonists, defend against what lives here, and rebuild the broken colony Ark to finish the journey.

Star Armada is a spaceship auto-battler where you assemble and command a fleet of capital ships and fighter squadrons. Unlock powerful new ships and outfit them with a range of turrets, energy shields, and starfighter hangars. Engage in automated battles, carefully timing unique abilities to win.

Tower defense where the maze is yours to build and the ammunition is yours to manufacture. 16 towers, a factory of belts and assemblers fed by enemy debris, and a card every wave. Reach wave 50 — then find out that Hard was the easy one.

2D space shooter and turret defense come together to create the Planetary Defense System this world needs! Shoot down asteroids and aliens and survive the bosses in this arcade like game featuring customizable satellites, projectiles, and upgradable Cannon and Planet Shield systems.

Build. Defend. Survive. Expand. A sci-fi base-building game on a hostile alien world. Gather resources, build a sprawling high-tech colony, and defend against relentless alien threats—then unlock new planets, new challenges, and the secrets of humanity’s last frontier.

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.

A 3d tower defense game set in space. Protect the last resource outposts from the ongoing Alien attacks! Can you hold out in these ever increasing difficult waves of enemies and protect the last of your resources and Energy?

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. *

Defend the energy cores from ever increasing enemy waves by destroying their spawn gates. Build tower mazes on Hex grid. Adapt them to dynamic changes in the terrain. Face quirky bosses. Design your own levels and share them on the Steam Workshop.

A last-stand auto-battler on a dead magic world. Choose your heroes, upgrade their abilities, and try to hold on one more night.

“Alien Marauder” is a real-time strategy game with survival and confrontation theme. In this game, you will be the leader to a treacherous alien planet, build and defend base to survive against the vexan waves. Make the right decision!

Be the ultimate CEO and military strategist in this genre fusion of strategy and business management. Create your own company, hire employees, research weapon technology, and take control of units on the battlefield to defend the moon against an alien invasion. Aliens down, profits up!

4 turrets, a ship in peril, and waves of enemies. Hold the line and defend the ship, robot.

Fight big battles in the mines, get to mining and collecting gold and minerals. build and upgrade your towers, power up with treasure chests. Defend your base from looting goblins! using variety of weapons and tower, from RPG, ak47, canons towers, to sawblade towers and more!

Build the most efficient intergalactic factory in space simulation strategy game Dyson Sphere Program! Harness the power of stars, collect resources, plan and design production lines and develop your interstellar factory from a small space workshop to a galaxy-wide industrial empire.

Armoured Onslaught is a fast paced Top-Down Shooter and Tower Defence hybrid. You will need to make use of both strategy and skill as you fight your way through near endless hordes of deadly foes.

Maia is a colony building game set in the not-so-distant future. Your colonists make planetfall on a hostile world and you must ensure their survival and their safety, constructing their off-world habitat from almost nothing and sheltering them from a dangerous, often deadly environment.

Autothysis is a first-person tower defense game where strategy meets precision. Deploy turrets, manage resources, and fight swarms of insectoid enemies. Target weak points to shatter foes while upgrading defenses to survive escalating waves. Can you withstand the oncoming horde?

Invader TD is a side scroller tower defense, where the player is in the role of an alien race with the purpose of infecting and dominating the earth, you must protect yourself from the attacks of the humans, who are trying to destroy you.

Eternal Siege is an evolutionary tower defense based around min-max resource management, efficient use of spells, and (hopefully) building some towers. Start in the Ancient Greek era and defend your way through the human eras (Roman, medieval, modern, etc). Can you survive the human extinction era?

A sci-fi tower defense where you design enemy routes and build defenses on alien planets. Combine 16 weapons, hold off counterattacks, and advance through a four-planet campaign. Research new gear, face wall-breakers and bosses, or try Endless Mode, seeded expeditions and the map editor.

A tower defense game with RTS elements about gathering cheese in space, where mobile carriers are able to deploy smaller spacecraft. Collect cheese to buy and upgrade spaceships and use each type to customize your playstyle and defend your base!

Build & defend a small remote mining base on Taichin XI from the alien hordes. Deploy defenses, upgrade your turrets and get ready for the nightfall. The Unearthened is a classic Idle Tower Defense game where you build towers and prepare for the invasion.

Design and drop your droids to fight, build, and conquer. Mine resources and outlast the relentless swarm to claim the planet.

Survive endless waves of dark entities, use your clicks as a resource, and grow stronger with every run. Find and upgrade powerful modules and unlock new technologies in this incremental clicker defense game. Also - Everything is square.

Explore the Solar System. Mine and drop asteroids. Colonize and terraform. Lead the space race and compete with other corporations on your way to profit. Watch the expansion of human race over the centuries.

Command Captain Hope's ship in this strategic 2D space game. Build structures, deploy fleets, and manage resources to defend the Citadel against waves of enemies. Combine direct ship combat, tower defense, and base building as you face epic boss battles.