A zombie game I found on Steam in February was Dread Dawn, as it gave me a Project Zomboid meets 7 Days to Die vibe. The game definitely looks like it will be fun, but we'll have to check to see how it plays when it releases. Check out the game's trailer below.
From the game's Steam page: "This is an open-world zombie survival game set in a quarantined city. You play as a student left behind due to missing the evacuation convoy. Together with classmates and other survivors, you must defend the school, survive, and await rescue."