The gun sound effects are pretty annoying. The overall shooting gameplay is lacking, but since the only enemies are stationary turrets it's not as big of a deal as it sounds. The environments look amazing, great job there!
The game seems to have a problem with a lack of direction, it's hard to tell where you are supposed to go to reach your objectives.
It could also use some more context and story in general. Atleast some hints as to what caused the paranormal events at the military base and why the player character is there in the first place.
Anyway, good work!