Love the art, the music fits pretty well too. One thing I'd add is a more obvious indicator for when you take damage. The damaged heats and regular hearts are so similar in color that it's hard to tell when you really took damage.
The use of stamina was also creative, though something like exhausting stamina only when jumping in the air might make the game less about stamina management and more about accuracy (don't know if that's intentional or not though).
Love the lore :)