Oh I enjoyed this a lot. I love the idea of using the shotgun as a bat. Visuals, sound design and atmosphere are great. Just a few issues I noticed:
1. The camera clips into walls. This can be very distracting when backing away from enemies
2. Somehow, enemy animations run at a very low framerate
3. Some sections are extremely dark and I also got stuck searching for the red valve. You should briefly introduce the controls ingame or map the night vision to a more common button like F
Looking forward to your next game!