First of all. nice vibes! I like the dungeon aesthetic and was excited to see what was around the next corner.
The first minigame where you turn the contraption was really creative and fun! It felt great to move and was fun and challenging to do while navigating the fireball obstacles. I haven't seen this mechanic in this type of game before, so well done!
The boss battle was neat and the second phase was unexpected and cool to see.
As other comments stated, I liked that the time limit of each room was connected to the health. The game feels quick and snappy because of that, and dying doesn't feel too punishing.
I like the game a lot, so I'm going to be a bit critical of certain aspects where I feel you could improve.
The fireballs themselves are the one area of critique I have. I'm not a huge bullet hell player, but I think usually when you have big lines of fireballs that's when the player uses so type of invincible dash ability to cross them, and that's how that type of obstacle can feel good. Since that's not in the game, the wall of fireballs didn't work for me (not bad, though).
Thanks for the fun game!