hey! I just played your game and played a few floors. For the 15 hours you mentioned you managed to get quite far :)
Some things that you could work on in my opinion:
- Fullscreen did not work for me (Just added black bars to all sides) and the mouse did not lock
- Interacting with E was not always working
- Head wobbling was a bit much, maybe turn it down a bit
- Font on the letter was a little bit hard to read
- Gameplay loop is pretty basic. Could extend on the basic principles with more variety
Other than that you got a working prototype in a few hours, so that is pretty good. Looking forward to see what you can do if you put in more hours :)