I think this is a really brilliant and adorable idea, brought to life by wonderful art and some charming writing.
The gameplay itself has huge potential. I love the light/dark shared resource mechanic and the variety of moves available and enemies to fight is really impressive. However, I think it needs more meat as fights became tedious as the difficulty ramped up and I'm afraid to say I didn't make it to the end.
Don't want to end on a sour note so I'll reiterate that so much of this is just fantastic, definitely a hidden gem of the jam so far and something I'd be very interested in an expanded, touched up version of.