Love the aesthetic, hate RE-like camera. Controls are wonky and really unintuitive, sometimes - W is forward or sometimes it's left or right. There is a lot of holes in your maps where you could just jump off to the void. But man, the fog and primitive geometry is really selling the vibe. Personally, in addition to disabling shadows, I would've probably used baked lightning. Did you build this levels using trenchbroom or used other tools?
Btw, thanks for linux build