Top similar games like Space Defender: Frontier Squadron:

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.

AGIS - A Game In Space is a top-down twin-stick-shooter.

Pilot a momentum-driven ship through the cooled remains of dead star systems. Master a growing arsenal, take on 10+ unique epic bosses, and tackle four sectors your way. The world is seed-generated. Enjoy 4 difficulty levels, NG+, and a rewarding skill / unlock system.

Escape corruption and deliver truth to the people in the only way you know how. as a space fighter pilot! You steal a ship and flee, it falls to you to duke it out in space and deliver truth to the people. Restore peace. Restore justice. Save humanity and Escape The Kreegan!

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. *

A space action-adventure unlike any other: navigate your spacecraft through a galactic-scale mystery. Make sure to loot, craft and upgrade your space fleet. Play the story campaign or test your skills in vicious arena modes against AI opponents.

Star Vortex is a fast paced Action-RPG inspired by classics of the genre. Design your ship, fight your way through hostile alien sectors, upgrade as you salvage rare weapons and experiment with different builds until nothing can stand against you.

A broke bounty hunter. A sarcastic robot. 1,000,000 credit debt. Star Scrap is a chaotic twin stick space roguelite. Blast through increasingly difficult waves of enemies to pay it off.

In Deadline: Aphelion, you play as a mercenary tasked with defending the research facility from the hordes of alien spiders that have been drawn to it. 

Alpha Force Zero is an intense top-down bullet-hell adventure that requires skill and planning. Utilize multiple weapon systems including an Auto-Turret with adjustable firing modes and unlock upgrades that you can equip in your ship to give you the upper hand. Dodge, fight, survive!

Sanctum Arcadia is a game where you must fight your way through increasingly dangerous zones filled with enemies, hazards, and mystery. Sanctum Arcadia has a unique but still familiar progression system, challenging and engaging combat, all in a smooth Arcade-like experience.

XenoFeud is an insane top-down twin-stick arcade alien shooter, where you must survive hordes of alien intruders while defending a mysterious object in space.

Survive increasingly difficult rounds in a floating arena. Use weapons and powerful abilities to knock enemies into the void before they launch you off the edge, build your loadout during each run, and beat your highest score.

Pilot through relentless waves of hostile forces in this fast-paced space-themed, bullet hell, survival shooter. Build your own UFO in the Ship Creator, Survive through a 100-wave campaign, or test your limits in Endless Mode. How long can you survive?

Pilot a breach rig into hostile corporate infrastructure. Mine the firewall, crack daemon cores, extract your haul, and buy permanent upgrades between sorties.

Neon Fighter is a tiny arcade game packed with lasers and explosions, in which every few seconds you are forced to switch weapons automatically, making you have to adapt quickly to the new situation and re-evaluate your perspective.

AREA WARS™ is a fast-paced 2D omnidirectional shooter where you battle enemies from every direction in a constantly changing enclosed area. Defeated enemies trigger chain explosions that engulf nearby foes and boost your score multiplier. Built for short, repeatable runs with score-focused gameplay.

You've been dropped into enemy space. Weave your Starfighter between alien spaceships, lasers, asteroids and bombs destroying as many as you can and collecting valuable coins and powerups as you go.

Cosmic Tank is a modern take on the classic game Asteroids. Mine your way to riches! Fight off hostile threats! Upgrade your ship and rent a few helpful drones! Survive epic boss fights!

Engage in an intense space shooter that you can play in single-player or multiplayer with up to 6 players. Play a variety of different spaceships, each with their own unique stats, components, and playstyles!

A sci-fi twin stick shooter stripped down to the bare essentials with focus on smooth controls and satisfying action.

This is a rogue-like top-down shooter where you control a spaceship that is sent out to explore the caves on the Moon. Once you enter the caves, you find out that there are enemies. It is up to you to survive against them while also trying to find the path down to the next level of the caves.

In this unique top-down shooter, originally released in 1987, take on the role of a lone pilot of a scout ship fighting to eliminate the threat of the Macro-Genetic-Mutoids, bio-engineered organisms that threaten to destroy mankind.

A 2D vertical shoot 'em up that lets you upgrade your ship with an insane amount of options. From missiles and pods to specials and shields, you can upgrade every bit of your ship from guns to thrusters.

A neon bullet-hell where the swarm is alive. Outlast escalating waves with pure movement — no cover, nowhere to hide. Just geometry, reflexes, and the void between enemies.

Rendagor is a 2D Top-down Shooter starring a service bot. Just a simple machine... or something more? Uncover dark secrets in Story Mode or master the challenge of Arcade Mode. Shoot, smash, and demolish enemies and destructible environments with a devastating arsenal.

Top-down arcade space shooter with retro pixel-art style. Fight waves of alien invaders across world landmarks, buy upgrades between battles, collect power ups, participate in events & missions, defeat epic bosses, and more.

Build and customize your own starship, then survive escalating waves of enemies and intense boss fights. Unlock new parts, upgrade your loadout, choose your difficulty, and climb the leaderboard in this fast-paced 2D top-down space shooter.

Devileader, a fearsome space demon who once have destroyed countless planets of the solar system is about to be resurrected by his minions and fanatics, who want to bring chaos to the universe. Pilot the agile space interceptor Deviship and survive the terror of this demon lord.

Sci-fi top-down twin-stick shooter with 9 weapons, 3 alts and secret hidden collectibles!

Art of Space is a fast-paced space combat shooter with some unique mechanics and customisation options.

Chaotic boss-rush, bullet-hell-y, twin-stick arena shooter mayhem! Dynamically changing arena forces you to be vigilant: Watch the bullets, watch the walls!

Rocks In Space is an indie arcade shooter with upgrades, unlockable ships, and no paywalls. Download now and get ready to fight the endless swarm!

Starwave Defender is an intense twin-stick shooter based around wave survival. Dodge swarms of enemies while exploring procedurally generated levels and collecting resources to upgrade your ship. You have a limited number of ships; make your time count, Defender.

Manage your shields, evolve your ship, defend Earth. Nano Squadron is a top-down space roguelite where every run brings new upgrades and every mistake leaves you exposed.