This is a really enjoyable game! the pixel art is simple, but very charming, and everything felt snappy and responsive. The level design was great as well! The way the game sends you back to previous areas felt very intuitive, even for me (who has no sense of direction).
I would have liked some music, and if I'm really nitpicking I think that the frequency of health drops and pickups kind of make the dark magic ability an obvious choice in most instances.
Really solid entry all around!