Like most other people, I really like the visuals! My small complaint is that I wanted to turn up my sound to hear the gorgeous music, but then I heard nothing but the jump sound. I suggest either lowering the jump volume, or adding a mute sound effects button.
I like the design idea of how deaths work. It treats the theme differently than other games! However, since hearts are so limited I found myself avoiding dying at all. Maybe killing an enemy to restore hearts could be a feature?