Top similar games like Protocol Xeno:

Primit Shooter 2 is a roguelike shooter set in a universe where cute but dangerous aliens spawn from the Eye Tower. Players must develop their character, pick suitable weapons, and brave through consecutive waves of alien challenges, combining action and strategy for a thrilling experience.

Ultra Mega Planet Battles (UMPB) is an intense arcade-style, space-based, twin-stick shooter. Players can play by themselves, or with up to 3 friends local co-op or Steam Remote Play (total of 4 players). Select your character, select and modify your ship, then get shooting!

Take control of a spaceship in this top-down action shooter and defend yourself and earth from the unknown mysteries and horrors off space!

Fast paced shoot em up played across 12 levels. Point your ship in any direction, deciding constantly between extra firepower (firing in any 2 directions) and movement. Or deploy the directional shield to block bullets from a single direction, point your ship and dodge simultaneously.

Fight for your freedom as you battle through wave after wave of alien adversaries. Destroy enemy fighters and collect XP to raise your level and become more powerful. Combine your skills and abilities with a huge range of power-ups to become the ultimate champion.

Gather a squad and fight for survival in We're All Going To Die. Work together with a squad using abilities, equipment and exploring different levels to make the most of your fight against your demise, after all, you're all going to die at some point.

- Co-op Twin Stick Shooter

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.

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

Xeno Crisis is an arena shooter in which up to two players take control of battle-hardened marines embarking on a deadly mission to confront an alien menace! Run and gun your way through thousands of adversaries, searching for survivors, and ultimately facing the origin of the outpost's demise.

ROGUE SHIFT is a high-intensity top-down shooter, set on a harsh planet that will test your will to survive. To stay alive, you will pit yourself against hordes of relentless enemies in an unforgiving, hostile environment.

Crystal Souls: Fragment Hunters is a top down indie space game where you shoot enemy ships, gather crystals, and upgrade your own ship.

Zap, blast, loot, repeat in this procedurally generated twin-stick arcade-shooter. Fight aliens, fight robots, fight anything that moves and a few that don't. Then loot them all.

Steinstern is a space action twin-stick shooter. Find your way through a variety of procedurally generated space mazes. Test your skills and your luck with many different weapons and configuration possibilities! Play alone in single player or in local coop mode with dynamic split-screen.

Sanguinite is a lunar-lander-meets-twin-stick-shooter action game with elements of resource management and exploration. Equip your remote drones and explore the dangerous surface of distant worlds. Bring resources and artifacts back to your ship. Investigate the origin of the aliens you encounter.

A retro-inspired, action packed, twin-stick shooter full of bullets, blood and explosions. Collect and manage your guns to exterminate jungle zombies, swarming bugs, heavy robots, slimy monsters and even space ghosts.

Brace yourself for explosive space battles in GalaxIverse II! This intense multi-directional shooter puts you in the pilot's seat against alien fleets and colossal capital ships.

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

A sci-fi wave-based shooter with roguelite elements. Collect powerful upgrades and unique combinations to wipe out hordes of bloodthirsty creatures and make your way into the Abyss.

Shoot from affar or get nibble away up-close and personal in a boss-rush, bullet-dodging revival of the 1982 Atari classic title, Yars' Revenge. Take on 60 unique enemy encounters alone or with a friend in local co-op.

"Raiden" unites! Get ready to blast into a thrilling new dimension like never before!

Team up and shoot down waves of invading aliens. Single player or multiplayer top-down shooting action

Aliens have invaded Earth! Towns, cities, deserts, they're everywhere! Take on the role of Earth's last super soldier and confront the alien menace in this intense twin stick shooter!

Black Skylands: Origins shows you the ropes ahead of the main game release. Learn the basic mechanics and meet the main cast of characters of this open-world adventure!

Survivor: Spark is the first episode of a series of anti alien invasion games. It's a classic transcendental third person shooting game!

Embark on a cyberpunk action-adventure in zero-gravity as brother Mailcom, on a mission to uncover dark conspiracies and determine the fate of Zion space station. Enjoy physics-based movement, environmental puzzles, emergent combat, all set to a mighty dub soundtrack.

Curved Space is an intense arcade-style twin-stick shooter that takes the classic formula and plunges it into the weirdest reaches of space. Battle cosmic space-invading spiders across curved landscapes where bullets hug the terrain while the horizon drops sharply out of sight.

A game about exploring space in search of hospitable planets for colonization. Casual gameplay and short rounds make it a great option for killing a few minutes.

Twin Stick Shooter Multiplayer Action Game set in small planets that can be terraformed as you play! in which not only your shoots, but also the enemies and planet environment are your weapon!

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

Survive the waves! Buy weapons and ammo! Unlock new stages! Purchase companions! Solve daily quests and get rewards! Casual Pixel Warrior is a wave shooter where your endurance to last an infinite fight depends on your skill, unlocked weapons and purchased ammo.