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Pretty good horror experience. I went a similar route because I wanted to get straight to designing the horror and puzzles (and also to justify all those humble bundle asset purchases, lol). Working with UHFPS is tough because it's just documented enough to feel like it's fully documented... but there's still a lot of things that aren't explained, and no API to help. I sympathize with difficulties of learning how to use other people's assets; it's a challenge in of itself. 

So, here's my feedback about the game:

• Great horror atmosphere and tension! I was nerve-wrecked most of the time!
  • However, needs more ambient sound elements, and maybe some simple special effects like dust particles in the air, or lighting casting long shadows.
• The puzzles were kind of interesting, but felt a bit too "lifted." It would have been nice to you utilize some of the props you got outside of the UHFPS bundled assets. I get it, making those systems work with someone else's models isn't as straight forward as you might like, but it would help the game feel more "customized."
  • Also the puzzles eventually got annoying enough for me to stop playing. I personally prefer it when I can solve one puzzle at a time, and then occasionally have one I have to backtrack for, but at one point too many puzzle pieces had added up and I started losing track of everything. Also, too much backtracking. 
• A quick note on the AI generated stuff. It's mostly just that it's obvious and a little immersion breaking. I used it for some idea generation and a quick cover art piece since I couldn't come up with anything more clever, but it is pretty obvious and it can turn a lot of people off. I'm going to be searching for more ways to avoid using it, or at least use it in less obvious ways, but it's just a note on the aesthetics, mostly.

That's already a lot, I hope it doesn't discourage you from making games. I think you have some good ideas here, and with refinement, it could be an interesting game! Keep up the great work!