CDDA is a zombie survival game with a heavy focus on realism in it’s mechanics. The controls can be intimidating if you’ve never played a game like this before. You might need a cheat sheet open on the second monitor or maybe your phone, but I think it’s worth the effort getting the hang of it.
CDDA is available for Windows, Linux, OSX, and Android.
I first heard about this about a year ago and it seems super interesting but god damn is it intimidating. I still haven’t given it a go!