Thanks for your feedback! I appreciate the kind words.
Looking back, a few things I would definitely change:
-make the UV light cone a little bigger, so you don't have to explore quite so thoroughly
-make it so the clues you're looking for are less ambiguous, and maybe make the solutions significantly clearer.
-make the rooms in the mansion a little more diverse, so exploring felt a little more exciting.
The goal was to make the player explore the spooky mansion, and I think it was a success in that regard! Unfortunately, the delivery seemed to miss the mark for some people based on the points you mentioned.