Wow! This is super polished and complete feeling. I'm a huge fan of Celeste, and this is definitely scratching that itch. It also reminds me of the Knytt series, which is another fav of mine. The over all aesthetic looks great, and though the audio was CC0/free, it was all well chosen.
The levels & progression was all spot on, and I enjoyed all my time with the game. My only nitpick, which has been addressed in a few places, is that it could be more "magical girl" themed... but hey, I still had a great time!
Awesome work!