The pixel art is great and the mechanics, well executed!
If there’s one point that I think could be improved upon, since it confused me until I checked the comments, it’s the fact that the game doesn’t explicitly tell you that paid doors lead to easier rooms. When I played through the game, I thought the two kinds of door just lead to different places.
Maybe adding a « Easy » sign above paid doors could have made this clearer.
Regardless of that, the platforming was very good and responsive, good job!