Incredible aesthetic! It is a really great throwback to the days of the original Doom and Half Life. The music, sound design, and fog effects also contribute to the really great atmosphere. The shooting, movement, and level design were all quite solid. Though as others have mentioned, it seems like the character turns significantly slower then the mouse movement, so I would often hit the edge of the screen with my mouse before fully turning, preventing me from completely spinning around. I also found the tanky bosses to be a bit too repetitive, but that might just be my personal preference. Overall, excellent work!