Top similar games like Space Mantlet:

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.

On a forgotten world, confront a malevolent machine intelligence. Extract minerals, build factories, power up the railguns, and arm the missile batteries. Defend the Fortress Omega against the alloyed nightmare.

Expansion is a sci-fi Action RTS where deck-building strategy meets fast-paced VR duels — battle AI or challenge real players.

Join our machine legion to conquer the world.

Co-op and Single player Tower Defense genre.

A grand and intense tower defense science fiction game, where you only need to purchase once to enjoy all the content of the game.

Tower Defense with resource- and base management! Waves of enemy robots with special abilities, shield and armor! Mining, refining and production for building and repairing! Environmental hazards and the best: the Orbital strike!

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.

You are the commander of the Black Talons company, currently stationed in the Oberon system. After an eventful campaign, the military Tzanar Union has overrun the planet of Genai and blocked all departure from the system: leaving you and the Black Talons stranded.

The early stages of an RTS I created in a gap year. Create your loadout, send your mechs to battle, capture objectives and destroy the enemy base

“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!

An exciting sci-fi real-time strategy game. You are the leader of a band of elite Marines on a rescue mission; it is your job to secure the outpost and rescue lost miners. Aliens are running amok; it won't be easy...

Protect the base from an alien invasion. Place cannons and destroy the invaders. Upgrade cannons to resist the enemies.

A classic tower defense game set in space! Build and upgrade towers, defend your portal from waves of alien invaders, and outsmart evolving threats across handcrafted and procedural maps.

2089 - Space Divided is a classic science fiction real-time strategy game in which you collect resources, build up your base, train troops and destroy your opponents with tactical skill.

Para Bellum - Hold the Line is a 3D real time small unit tactics game. Your task is to hold off enemy attacks wave after wave using a variety of different Units and Supports in your arsenal to the best of your abilities in Campaign and Skirmish modes.

This is a sci-fi strategy game featuring a Defense Mode focused on tower defense and an Attack Mode focused on combat. The game includes over 30 different buildings and units, all of which can be upgraded through entry editing to enhance their performance and firepower.

Build mechas, form mecha teams, and command them to fight.

Star Trek: Prelude is a space-based game that builds defense towers on earth to defend against alien invaders called Black Ember.

《热血指挥官》是一款科幻RTS游戏，实时战略对决，万人在线竞技。在危机与机遇并存的银河系中，你将成为一名银河指挥官，掌握高科技武器和装备，指挥数百个战斗单位，运用智慧和策略与异形及其他势力展开激战，书写属于你的星际传奇！

In this game, you are a leader, leading a force of army to fight other forces in the deep spaces. You will plunder their resources, build your homelands, explore and expand, managing your army both strategically and tactically. This will be a saga written with blood and fire.

Build your towers, plan your efforts, watch out for changing paths and strike back against the alien invaders in this challenging tower defense game!

Lead the Mobile Infantry in this RTS game set in the Starship Troopers film universe. Balance your army composition with a diverse set of unit types, overcome line-of-sight and line-of-fire challenges through tactical positioning, and use special abilities to smash the Arachnid hordes!

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.

A strategic space tower-defense game. Enemies detect, warn, and try to bypass defenses, forcing you to adapt. Combine diverse towers and face unique maps for varied battles. With tense sci-fi atmosphere, it delivers a fresh experience beyond traditional tower defense.

Defend galaxy against Alien invasion in the RTS offline game with roguelike fun

In this massive RTS game, command vast armies fighting for control of entire worlds. Control the forces of Earth, the mechanical AI Substrate, or the enigmatic Post-Human Coalition as you battle across the solar system in single player, cooperative multiplayer, or competitive multiplayer.

Immortal Generals is an action-packed real-time strategy (RTS) game set in a futuristic global conflict. Build fortified bases, manage your economy, command advanced armies, and turn the tide of battle with devastating nuclear and biological superweapons in multiplayer warfare.

Tower Defense meets a Visual Novel narrative. Place an arsenal of towers to halt the invading enemy. Use special abilities such as napalm strikes, EMP blasts, and orbital lasers. A sci-fi space drama, filled with dialogue choices.

Lead the forces of a human empire in a brutal squad-based RTS. Capture territory, secure vital sectors, deploy fortifications, and unlock new units and upgrades mid-battle to outmaneuver and crush the alien threat.

Space 4X game with the ability to build factories, extract resources, with characters, internal and external markets ... Take part in the discussion of the game, share your vision)

Fight for control of a frontier world. Gather resources, build your base, and command your forces in battle. Survive long enough to unleash your ultimate weapon - THE EPIC.

Leave No One Behind is tactical real time strategy war game. Experience some of the hardest battles fought during the Vietnam War in 1965 between US Army and the Army of the Northern Vietnam for landing zones X-Ray and Albany and for Plei Me special forces camp.

World of Towers combines puzzles with tower defense. Design your base in order to collect all of the puzzle pieces and destroy your enemies. Create and share your own worlds on the Steam Workshop using the World of Towers World Builder

Modern / sci-fi strategy in (rough) terrain, space, sea. Vehicle designer with custom weapons and custom chassis sizes. Some realism-inspired mechanics and complex rules including vision, sensors, destroyable components. Turn-based campaign about battles, survival, lite 4x and resource management.