Games like Ultimate Zombie Defense 2 on Steam
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Midnight Heist
Go on heists through Midnight City alone or with up to three friends to fulfill tasks as a hacker for various organizations. Improve your reputation, earn money and uncover the secrets of shady companies in this co-op horror game.
Backrooms: Escape Together
A visually lifelike co-op horror for 1-6 people. Journey through 9 procedurally generated levels, using what's available to survive and progress deeper into the Backrooms.
The Infected
The Infected is a survival crafting game set in an open world sandbox. Build your base defend and protect yourself from wildlife and infected Vambies. (Hybrid Vampire-Zombie)