Thank you so much! I'm happy you enjoyed this little demo-thing! Really good to hear somebody say that they actually like my game!
I made this mostly by working at double-speed, so a lot of bugs were swept under the rug or given band-aid approaches. A lot of code is also reused from my main project, or tied together. Keys and Boss Doors use the same basic code, and NPCs are just practically just enemies with a speed of 0 and no damage hitbox...