if you want some specific comment.
I can see your effort put in audio and levels.
The post processing and particle system effects makes gameplay smoother.
The gun shakes like Parkinsonism when I rotate my camera. (jk its just some minor thing)
My favorite part was the gun shooting cuz you know shooting are awesome.
One more thing I think the parkour was too hard. If less parkour, more mobs to shoot. the gameplay part would be so much enchanced.