Really nice. I'm getting a lot of quake 1 vibes.
The game runs mostly well but there is some stutter at start of every level and drastic fps drop when multiple four-legged enemies get close to player.
The initial stutter could be caused by shader compiling (are you doing something to hide this?) but I have no idea what could cause the slowdown with the enemies. Profiler might reveal something. Unless of course this happens only on my machine..
Edit: I played on a laptop running Xubuntu 24.04 with Intel Arc GPU.