So cool!
The visuals and the audio are both excellent. Everything looks smooth and connected visually, and the audio is like a cherry on top. Considering the gameplay, I enjoyed it very much. Shooting is very impactful and satisfying. Killing a zombie has never been more fun for me before! The only thing I'd like to see on top of the current design would be a melee weapon and maybe shooting vertically. The resolution restriction seems to be utilized very well too.
Excellent job!