Top similar games like Planetary Defense:

3D Sci-Fi arcade Shoot'em up game. Destroy asteroids and aliens. Shoot them all!3D arena shooter with multiple worlds. Spaceship simulator and shmup arcade style game.

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.

PewPew! - move, shoot and upgrade!

By choosing one of the two ships, destroy bizarre enemies in neon worlds.

Refighter is a lightweight Rogue-like flight shooting and strategy game where players will control spacecraft to engage in battles in space, equipping various bullets and upgrading their levels. Face off against a diverse array of enemies and Bosses.

Earth Space Defenders is a starship twin-stick real-time shooter action game. Experience story of menacing green smoke that plagues whole universe. Supports steam multiplayer and party play with multiple controllers.

Blow up bots beyond the stars. AI Driven 2D Spaceship Warfare

Hyper Frenzy is a free arena-styled singleplayer 2D space shooter using top-down perspective. Fight in different modes against bots, collect various items and use one of the plenty weapons to defeat your opponents. Create your own maps and gametypes.

Crossfire II is an Retro / Arcade / Top-Down Shooter, originally released in 2002 for the AMIGA. The main part of the game is a classic, fast paced, single player story campaign. Fly different space ships and fight, to save the universe as you know it. Also you get a survival and a local PvP mode.

Aero Striker is a highly stylized action-packed flight combat simulator game that is intentionally designed to be easy to make it more enjoyable and less nerve-racking. The aim is to have fun making aliens explode while experiencing the sensation of flying. Let none of the evil aliens escape!

Neon Arena is a space arcade scoring arena game.

A 2D, top-down shoot'em up with simulation elements, deeply reminiscent of those vector games from the 80s. Blast your way trough space, enemies and mystery. Upgrade your drones. Endure your mothership's AI cynical attitude and survive the most realistic shoot'em up ever!

Repel extraterrestrial entities!

Survive 10 enemy stages! Shoot 'Em Up style, spaceship game, in pixel art and 8-bit retro music! Evolve your shot to the maximum level, use the energy bar for upgrades, and special abilities! Advance each stage by defeating Bosses and enemies to collect new skills, transformations and extra lives!

Royal Odyssey is a retro-style arcade space shooter where you pilot Prince Zayven’s ship through a deadly asteroid storm, blasting your way to survival.

Gratuitous Shooty Game is a hobby space shooter made by the developer of Gratuitous Space Battles, reusing the art from that game :D.

Collection of a few arcade classics, remade with a fresh and friendly looking art style and a beautiful soundtrack.

Use the force of gravity in this fast-paced space shooter with realistic physics and orbital mechanics.

《Geometry Raid》is a rogue-lite space slash shooter game, the game combines classic barrage shooting and sword slash game elements. By driving a two-part ship,you can shoot and swing tail to crush the enemy . The game focuses on hardcore physics simulation and maximizing the melee slash experience.

Kill it. Take its gun. Rinse and repeat. WARNING: You will die. A lot. Probably. This 2D Retro shooter is about as hard as it can get, but repetition and good luck will cut though everything like warm cheese. This game grows with the community, and more bosses will challenge you in the future.

A frenetic couch-coop 2D top down battler for 2-4 players, set in orbit around a black hole. Use orbital mechanics to curve your shots, outmaneuver your opponents, and survive.

Bullet hell meets auto-shooter in this roguelike color-matcher where RGB itself is your weapon! The Maiden of Light has been captured by the forces of entropy. Six challenging bosses stand in your way and only you can save her!

Retro-inspired arcade-style shooter. Save humanity from incoming waves of flaming hot meteors, alien ships hell-bent on destroying humanity, and the strangeness of space by shooting, blasting and nuking incoming waves of meteors and enemies.

Gray goo is a short retro arcade shooter with lots of upgrades. This game is about destroying goo in space and saving the universe.

A retro-inspired 2D space shoot-em-up. Mine asteroids! Shoot alien saucers! Get rich or die flying!

LaserShotz is an online PvP competitive arena shooter! Compete for the best rating on the leaderboards!

Inspired by classic Japanese shooting games, SHINORUBI is a pure dose of adrenaline and frenetic arcade action with all the best aspects of Japanese bullet hell games, optimized for modern PC in ultra HD, all in a polished, accessible with many levels of difficulties.

Pulse laser battles between you and enemies.

Fight against an ever-evolving threat in this skill-based twinstick shooter 14 years in the making.

A fast-paced sci-fi space survival shooter where you blast through relentless enemies, upgrade your ship, and climb the global leader-board.

Defend Terra against the onslaught of hostile invaders in this 2D top-down space shooter. Upgrade and empower your ship's different systems to stand a chance against the growing threat. If you fall, Terra falls, and the rest of the galaxy will soon follow.

With easy-to-master controls, a simple objective, beautiful top-down 2D graphics and an 80’s arcade game spirit, FINAL PILOT is an online multiplayer battle royale set in the deepest reaches of uncharted space.

Join the fight against alien invaders in Pink Devil. Pilot an upgradable fighter jet through diverse environments, from oceans to deserts. Face unique bosses with distinct tactics and use weapons like machine guns, lasers, and rockets. Become the unstoppable Pink Devil and save the planet.

Alien Wall is a powerful genre mix between a brick breaker and ‘shoot em up’. Modern retro Arcade fun at its best!

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.

Meteorite MinerIn this thrilling 2D space mining game, you'll take on the role of a daring asteroid miner. Armed with your trusty mining laser, you'll blast through space rocks to extract valuable minerals and resources.