Thanks so much for taking the time to play and write all of this out! I really appreciate the detailed feedback.
After reading your comment, I went back and tested the game again, and I noticed the issues you pointed out almost immediately—especially the computer sound effect and the voice-over volume. I'll definitely be adjusting those.
The buttons opening on hover was actually an intentional choice since it's common in FNAF, but I can definitely see how it feels unusual, especially for people who haven't played those games and on mobile devices. I'll give that some more thought as I continue improving the game.
Thanks again for the feedback and for the encouragement! It really helps.