Games like Orbital Defense Force

"Gatekeeper is a Shooter game with exceptional mechanics, splendid graphics, and spectacular music. Play solo or team up with a friend in multi-player co-op mode. Your mission: reclaim the stolen Heart of the Universe from an unknown galaxy, utilizing unique abilities of playable characters and collectibles to defeat ancient guardians and unlock new locations."

Void Scrappers is a frantic, rogue-like 2D shooter set in a cyberpunk world. Assemble your loadout from a variety of weapons and abilities, and face off against hordes of enemies in procedurally generated levels. Fight for survival, collect scraps to upgrade your gear, and defeat powerful bosses to progress. Every run offers a new challenge, making Void Scrappers a highly replayable experience.

In "Time Wasters," players manage a futuristic waste disposal facility, dealing with peculiar trash and mysterious time anomalies. Upgrade your equipment, research unusual items, and adapt to ever-changing challenges to keep your facility running smoothly. Balance productivity, safety, and employee happiness to become a successful Time Wasters Inc. franchisee.

Deadzone: Rogue is an intense cooperative or solo action game where you battle through a biomechanical spaceship filled with hostile enemies and massive bosses. Customize and upgrade over 30 weapons with elemental effects to match your playstyle. Tackle each mission with adjustable difficulty, coordinating attacks to survive relentless waves of robotic foes.

"HYPERCHARGE: Unboxed" is a team-based tower defense game where players protect a toy store from waves of enemy robots. Players can unbox and deploy a variety of toy weapons, traps, and defenses to hold off the enemy. Cooperative play with friends is encouraged, as communication and teamwork are key to success. Fight to keep your toy store from being overrun!

"Titan Attacks!" is a classic arcade-style shoot 'em up game with modern features. Protect your planet from hordes of invading aliens, using a variety of upgradable weapons and power-ups. Experience the thrill of survival as you battle through increasingly difficult levels, with boss fights at the end of each stage. The game features retro pixel art graphics and a chiptune soundtrack that heightens the nostalgic feel.

Hive Jump is a fast-paced, action-platformer where you play as a brave space marine tasked with eradicating alien hives. Use a variety of weapons and equipment to navigate through procedurally generated levels, and work together with your team in local or online co-op. Fight challenging bosses, collect resources, and upgrade your gear to save humanity from the alien threat.

"Sentry" is a Science Fiction Shooter game that offers various play options, including single-player, co-op for 2 players, and multi-player. As a member of the SENTRY Defense Program, your mission is to protect your vessel while it flees across space, using an arsenal of weapons, traps, and environmental destruction to fend off alien boarders. If your SENTRY falls in battle, another crew member will be thawed to continue the fight, ensuring that defeat only changes the strategic landscape aboard the ship. The game boasts beautiful gameplay and outstanding visuals.

"Fortified is a thrilling strategy shooter set in a 1950s retro sci-fi world, where players defend Earth from a Martian invasion. Combining third-person shooter, real-time strategy, and tower defense mechanics, players can enjoy single-player, co-op, or multiplayer modes, building defenses and wielding an arsenal of Cold War-era weapons. Protect the city against towering attackers and experience an exciting blend of gameplay styles for a unique and immersive adventure."

Steambirds Alliance is a massively-cooperative bullet-hell shooter! Fly with dozens of friends in an open world full of cruel bosses and endless cascades of deadly bullets.