Top similar games like Protocol Xeno:

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.

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.

Dead End Job sends you into a madcap, Ren & Stimpy-esque world to bust up ghosts. It’s a procedurally generated, couch co-op, twin-stick shooter that straps a vacuum pack to your back and puts a plasma blaster in your hand. For you, it’s just another day in the office.

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

Survive in the deep void of the galaxy against thousands of invaders! Nebula is a challenging bullet hell, twin stick shooter where you have to face endless waves of space enemies. Additional map resources and space drones can provide you a support but be wary, they can as well become a deadly trap.

Clean up the streets in this hard-hitting action game! Enter a gritty saga of three complex individuals, each driven by their own motives and vices, their paths intersecting in unexpected and violent ways.

Where Sound Becomes Sight, Style Meets Violence. Step into the world of darkness as a blind protagonist who sees through sound in this stylish 2D top-down shooter where every kill matters and style is everything.

The patrons of Jonny's Room weep for their loss, it is up to you to dab their tears! Click-and-shoot through combat and puzzles to test your heroic spirit.

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. 

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

Become an agent of vengeance in this bullet-heaven action roguelite! You are the lone survivor of your squad, on an alien planet with just your weapon, a jetpack, and the courage to keep fighting. Kill off alien swarms and transform their valuable guts into explosive upgrades and vital utilities.

Dodge, shoot, survive! Polygon pursuit is an arcade-style twin stick shooter where you are pursued by multiple enemies constantly. You play as a lone circle confined in a polygonal world fighting to survive against waves of unique enemies. This is not an easy game.

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

Dive into a 2D action game where you control a spaceship, defeat enemies and overcome deadly traps. Extend your arsenal by collecting new weapons and technologies for your ship that you will need to conquer four different dungeon-like worlds, all connected by an open space full of surprises.

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.

Don’t be fooled by its cuteness. Rightfully, Beary Arms is a bullet hell, roguelite that will punish and reward you. Augment weapons to create unique weapon builds, pick rewards as you explore levels, alter mechanics to your benefit and peril, fight, die, become stronger, and do it all over again.

Space Ace is a 2D top-down shooter that focuses on upgrading your ship to fight through levels of Bosses and smaller enemies. Play with keyboard + mouse or Xbox controller.

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!

Deep Deep Deep Nightmare is a 2D Top Down Shooter. Survive by facing monsters in the nightmare of a little boy who didn’t heed his mother’s warnings that eating too much before bed can cause nightmares.

Friday Night Bullet Arena is a top-down multiplayer shoot-a-thon with a twist: each player only gets one bullet! You can catch your own bullet to fire again, but catching other bullets is... not recommended.

Collect synergizing items to create an overpowered character to fight hordes of cyclops monsters. Cyclo Chambers is a fast-paced, top-down arena shooter with light rogue-like elements. 150 items to choose from to create frantic combinations. Different runs every time.

A top down, twin stick shooter inspired by classic retro arcade games with loads of enemies, fast paced bullet hell combat, big boss battles and tons of bullets.

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 to survive in this intense twin-stick shooter! Hold off against increasingly dangerous waves of enemies by equipping yourself with items, sentries, and drones. Piece together ridiculously powerful builds by finding creative item synergies and unleash hell to defend the outpost at all costs!

A top-down shooter where you run and gun down bad guys as the vigilante, Rider. Vastly outnumbered, quickly kill and quickly die as you sweep through multifloored buildings bringing criminals to justice.

Shoot, loot, and toot your way through Saturday morning cartoon inspired Floops Big House Adventure! This love letter to 90's and Nickelodeon cartoon style will have you rolling with laughter as you defeat hordes of evil monsters and giant disgusting bosses.

Frontline Survivors is an intense top-down shooter with roguelite elements that puts you in the boots of a soldier fighting for survival on the battlefield. With countless enemies coming at you from all sides, you will need to use all your skills and strategy to stay 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.

Cellosseum is a bullet heaven following the progress of a lone cell as it battles a variety of enemies on its quest to guide the evolutionary process of life itself. Upgrade your attacks, shields, health, and speed to understand your role in the creation of life on the planet of Ceres Prime.

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!

Pulstar is a fast paced arcade game that brings back the basic of its genre. No nonsense, just kill as long as you can to gain the highest score as possible! This concept gives Pulstar the challenge and high replay value real fans of this genre need!

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

Core Breach is a fast-paced, twin-stick arcade shooter in a pixel art style. Play as a Trojan worm virus, outmaneuvering and destroying antivirus enemies. Upgrade your worm with powerful attacks and skills as you fight to breach the CPU core and uncover its secrets