Wow that was amazing! I was working on a game with similar controls and am very impressed you got first person controls working so well. I really like what you did with letting the player know they're close to a wall.
Did you use something like Steam Audio for your reverb calculations? It was very easy to find where things were and I never felt like I was lost.
I could easily see this turning into a full story driven game similar to Mouth Washing if you've ever heard of that. The one thing I'd suggest is have an objective reminder.
Oh, there was one bug that happened where I paused the game for a bit to do something, then unpaused it and the interactions stopped working. I ended up having to restart the program, but because you had a save system, it worked perfectly after that.
Good puzzle there at the end too with the power management.
Man, that was such a great experience!
Oh and the voice acting and story were also really amazing as well!