Games like Second Extinction

"Killsquad is a fast-paced, co-op Hack and Slash game for up to 4 players with five hero classes to choose from. The game features short, action-packed contracts and a variety of weapons, skills, gears, and talismans to customize your character. However, it has lots of grinding and is known for its bugs."

"Minimum is a sci-fi shooter with multiplayer mode, featuring spectacular visuals and mechanics, customizable weapons, and a blueprint crafting system for armor sets. However, it suffers from being poorly optimized, has plenty of bugs, and requires lots of grinding. Despite its flaws, the game offers a unique art style, robust crafting system, and a solid core game mode."

No More Room in Hell 2 is a tense co-op survival horror where up to eight players must navigate zombie-infested zones using strategy and teamwork. With permadeath and dynamic, ever-changing environments, every decision carries weight against relentless hordes. Survive, scavenge, and complete missions while battling infection and deadly threats lurking in the dark.

Starship Troopers: Extermination is a pulse-pounding co-op first-person shooter. Join the Deep Space Vanguard, an elite Special Forces branch of the Mobile Infantry, in the fight against the Bug menace and claim victory for humanity! Your trusty Morita Assault Rifle, support tools, and fellow Vanguard Troopers are all that will keep you alive while exploring the hostile surface of these ugly plan…

"Boundary is a tactical multiplayer shooter where players, as Astroperators, engage in zero-gravity combat in space installations. The game offers personalized space suits and weaponry, promising intense 3D battles. However, it has been noted for being very grinding, having bugs, and requiring patience."

Overkill's The Walking Dead is a four-player co-op horror shooter set in the post-apocalyptic Washington D.C. of The Walking Dead Universe. Each character has unique abilities, skill trees, and story arcs, with a focus on teamwork and strategic gameplay. The game boasts intense action, detailed graphics, and a wonderful soundtrack, but is marred by grinding, optimization issues, and annoying ads.

"Aliens: Fireteam is a third-person survival shooter set in the Aliens universe, where players battle through four campaigns with up to two additional players or AI. The 'Into the Hive Edition' includes a new campaign and the 'Ultimate Edition' offers additional DLCs, weapons, and the full suite of Endeavor Pass cosmetic DLCs. Build your fireteam and explore the mysterious planet LV-895."

FBC: Firebreak is a cooperative first-person shooter where players defend a federal agency headquarters besieged by otherworldly threats. With dynamic crises, customizable guns, and a variety of enemies, the game emphasizes teamwork and strategy in an intense, unpredictable environment. New systems and content keep gameplay fresh and immersive.

"After the Fall" is a VR co-op shooter set in a post-apocalyptic Los Angeles, where players must work together to fight off hordes of mutated monsters. Armed with a variety of weapons and abilities, they must scavenge for resources, upgrade their gear, and hold out against the never-ending onslaught. With a focus on replayability and tactical teamwork, "After the Fall" offers a thrilling and immersive VR experience.

"Ripout is a Co-Op horror shooter with excellent graphics and mechanics, allowing 2 players to fight through mutant-infested spaceships, collect loot, and customize characters in search of humanity's last bastion. Engage in high variety of reconfigurable monster battles, with a derelict ship exploration in single-player or small teams. The game's phenomenal atmosphere and grinding opportunities ensure hours of entertainment."