That was charming! I really like the concept and character design; the splash screen in the intro was a good touch! The fast fall is a little awkward, but the mechanics are competent and fun to use.
The soundtrack is cool, but a little awkward. I like the musical ideas present, but there seems to be a lot of unintentional dissonance.
I got stuck on the second boss; they fell into the spikes dozens of times. I tried your suggestion below of quitting and loading the save, but it doesn't seem to change anything.
All-in-all, good work!