Fantastic work! Really cool ideas and the art is particularly well cobbled together. It looks like I'm playing some kind of weird coloring book. Is all the art taken from public domain sources, or did you create some of it yourself? Regardless, I thought gameplay and art and sound were on point. Lot's of juicy animations helped to polish this experience a lot too, though I'd also say that the hit boxes were a little funky. I always prefer too generous over too stingy, but It might have worked better to  make them visually closer to the area, as some jumps appeared to be impossible but were actually pretty simple to make.

Great job overall!