You are a genetically enhanced super soldier tasked with defending Earth from an onslaught of alien foes. Blast your way through endless hordes in a conspiracy riddled side scrolling bullet hell adventure and become more dangerous than the truth. Become the Chimera!
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No game lists Chimera CUSTOM XG as one of its co-op favourites yet, so here are the closest matches by Steam tags instead.
Portal Dungeon is a side-scrolling Roguelite adventure game that supports up to 4 players in co-op mode. You control an adventurer as you and your friends bravely set out to find the last portal in this world. Go forth! Defeat powerful enemies! Save the world!
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Broventure = Vampire Survivors + Base building + Co-op. Band together with friends and obliterate hordes of grueling enemies, gather crucial resources, and transform your camp into a sanctuary of liberation.
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Hitler won the war by splicing animal DNA with humans: The Binary Super Soldier. You are the very first Binary Elite, designed to usher his reign to the end of time. But will you? HELL no. Camp Z is an alternate history 2D side-scrolling run-and-gun shooter with online co-op.
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Warden’s Will is a fast-paced movement-based roguelite shooter you can enjoy solo or up to 3 friends. Pick your Warden, try out different builds, and jump into chaotic arenas filled with unpredictable robots. The game challenges you to move smart and react quickly and try new builds with every run.
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Third-person bullet heaven meets explosive co-op action! Swing, dash, and blast through monster swarms while combining upgrades and discovering rare evolutions to create game-breaking builds of destruction.
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Top-down co-op shooter powered by explosive EDM/Metal beats. Survive endless hordes solo or with up to 4 friends online. Intense roguelite action where every drop shakes the arena. LET'S GO SWARM!
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Old friends and bitter enemies await as you invade Earth alongside a Mothership full of alien friends! Blast, beam, and bite your way through an endless swarm of enemies as you and up to three of your fellow hominids cause mayhem with a huge arsenal of weapons, mutations, and acrobatic maneuvers.
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A free-to-play 90s-style bullet-hell shooter with high-res graphics, unlocked 60+ FPS, single-player campaign, and online co-op multiplayer!
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Get ready for a wild third-person action journey where nature strikes back! In this explosive roguelike bullet hell, you play as fearless animals sworn to protect their forest from a relentless technological threat: invading robots set on exploiting natural resources and destroying the environment.
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Back To Back is a Top-Down Rogue-Lite built for Multiplayer. Survive endless waves of enemies while continuing to get stronger, but be careful to work with your friends as their bullets are just as dangerous as the enemy's.
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