Silent Dreams and Headup have just recently put up their Zombie survival RPG, Dead Age, up on GOG so anyone can now grab this positively rated game DRM-free. Originally released back in 2016, GOG are a bit late on the uptake with this one but good things come to those who wait.
I remember quite enjoying Dead Age when I played it a few years ago, it has a good mix of gameplay elements to keep you interested. Multiple endings, progression for your next run if you lose everyone plus each run through is different too thanks to randomised survivors and missions.
In related news, Dead Age 2 is in active development and it will also be available on Linux as we confirmed in a previous article.