This was super cool and a really clever use of the theme! The atmosphere was cool and spooky and I loved the story. It was so much fun to discover! One minor nitpick I have related to the story, from exploring around in the loop before I got killed for the first time, actually found the matches and clock key before I knew how they were relevant. The matches were fine, as I didn't know their use until I needed them, but it was a little annoying to be able to examine the clock key but not pick it up, which was my first instinct and kind of broke the flow of the game for me as it became kind of obvious what the twist/solution was at that point. I think it'd be good to just hide it and have it only appear once you can use it the same way that the bedroom key does. It might make it more likely that players would experience the death loop looking around again for it, as I didn't since I just made a beeline for the solution after I died once. But that's a small thing that I think would just further elevate what you already have.
On the technical side, I definitely appreciated getting to change the mouse sensitivity, but because I was just clicking it up and down with no UI it was a little hard to dial it in just right. Also even with it relatively low, if I moved the mouse too fast my vision would snap to the floor or celling, not sure what that was about. (although tbf I was playing the webgl build so that could be part of the jank with that.)
Overall though, you should be really proud of this one! Congrats on making such a cool game!