Top similar games like Astra Defender:

Bull3000VRTS blends intense VR shooter action with strategic RTS gameplay. Master both precise aiming and tactical decision-making in a future desert battlefield. Unique mechanics, such as the Ghost system and 3-resource strategy, offer a fresh, immersive experience in both 1v1 and 2v2 modes.

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.

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?

Era One is an innovative space game that combines elements of real-time strategy, base building, space survival, and tactical battles. Players can create and customize their bases from scratch, construct various types of structures and warships, manage fleets, and engage in tactical space battles.

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?

Micro Wars is a fast-paced RTS that throws you into the action in short, intense online battles featuring up to 8 players. Tailor your strategy with a variety of commanders and units, build your base, and micro your way to victory. Hone your skills with the campaign, and then climb the ladder ranks!

In this action/strategy game you control a spaceship and a team of 4 units. Explore a strange alien world, build new weapons & upgrades and fight the forces of the Exomachinist.

War to the Core is a tactical multiplayer war game where fleets of motherships battle for global domination.

Co-op twin-stick base building survival game.

Crossfire: Legion is a real time strategy game featuring tactical action in furious battles across a shattered version of the near future. Raise and customize your army to engage in intense online combat and carve your own path as you rise through the ranks. It’s a new generation of warfare.

A sci-fi Tower Defense game. Strategize to destroy waves of rogue robots and assist the powerful turrets with player controlled drone. Build and collect resources and help evacuate your crew from the alien planet.

Metal Mars is a real time strategy game where you race to gather resources and build on mars! This game can be played locally with a shared screen with up to three friends (4 players total). There are also 30 challenges to complete against the CPU!

Use ships to attack and destroy enemy space stations in real time.  Navigate through different randomly setup star maps to get to the exit and win.  It's a 2D single player space game that's massively replayable.

MIND MAZE - is a logical competitive game based on capturing of the playing field.

Peanut Butter Jelly Wars is a thrilling real-time strategy (RTS)-lite game where players face off in an epic battle to determine which spread reigns supreme!

A real-time strategy game in which you fight to secure the victory of your Bacteria over the Cell Defense Force and other enemy Bacteria in a world where your units are your only resource, and where your mobile base will not be enough to keep you alive.

Frantic 4-player laser ricocheting top-down shooter. Keep it casual and enjoy the chaos, or master the surprisingly deep mechanics to obliterate your enemies. Duke it out locally in free-for-all or 2v2.

A real-time strategy combat game based on the world of the Line Of Defense. Command a team of four Galactic Command marines in highly classified missions in space and on planets.

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!

Stake your claim, command your fleets, and wage epic war in space.

Blast your way through countless leagues of enemies in this intense top-down shooter.

With the shifting gravity on your side, aim your cannons, blast your enemies and enjoy the fireworks. Worbital is a real-time strategic artillery game in space, peppered with a heavy dose of cosmic chaos. The goal: be the last civilization standing!

An online action RTS where the tide can turn in a flash!Fight exciting battles where you recruit golems to battle your opponent’s slimes, cleverly redirect their slimes with walls, or sneakily steal their flag to make a dramatic comeback.

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.

Space Gears is a next-generation Strategy set on Mars. Don't fret about micromanaging build orders, or your resources. Set your sights on victory by raising an army of mechs and build up your base in this fluid and fast-paced PvE and PvP strategy game.

Survive in a maze and eliminate your opponents with bombs, shurikens and melee weapons in this 2D fast action game.

Activate your Neural Link to gain an omniscient view of the battlefield. Experience the conflict at any scale, as you plot the course that will lead your fleet to victory. Eternal Starlight is a tactical space combat game, built from the ground up for VR.

Negative Energy is a tower defense game with basic RTS mechanics, where your goal is to defend the construction of a Dyson sphere, while fighting against waves of hundreds of enemies ships.

Build a battleship and fight through unforgiving space to save your people. Make strategic decisions, guide your people, meet allies and foes, and battle for your right for a home. The tale of a lone spaceship on a centuries-long mission from Voidship: The Long Journey greatly enhanced and updated!

Empyrean Frontier is an epic real time strategy game that mixes classic RTS gameplay with a multi-stage campaign in which the player commands a fleet of ships through a galactic map. Boss battles, base building, planet destroying superweapons, and tactical skirmishes create a unique blend of genres.

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

Customize your Ships, Upgrade your fleet, and Command your way to victory in this ruthless rogue-lite tower defense/real time strategy hybrid. Take on an enemy that learns from your moves and adjusts its own path. Do you have what it takes to persevere?

Cyberwinter is an isometric action strategy game. On a distant planet with a harsh climate, you have to fight legions of dangerous monsters for a new home for humanity. Build bases, develop and defend them.

Tanks Etc. is a modern reimagining of co-op overhead arcade classics; it offers classic gameplay while adding in depths of strategy to keep players reinventing strategies for waging war with their friends.