7 Days to Die has redefined the survival genre, with unrivaled crafting and world-building content. Set in a brutally unforgiving post-apocalyptic world overrun by the undead, 7 Days to Die is an open-world game that is a unique combination of first person shooter, survival horror, tower defense, and role-playing games. It presents combat, crafting, looting, mining, exploration, and character growth, in a way that has seen a rapturous response from fans worldwide. Play the definitive zombie survival sandbox RPG that came first. Navezgane awaits!
https://steamcommunity.com/app/251570
It's 24.99 on Steam, but it's on sale through Humble Bundle for 9.99. The sale ends in 2 days.
https://www.humblebundle.com/store/7-days-to-die
Just a note, it is in the alpha stage, so it's not extremely polished and you may encounter some bugs.