It's a good start, with cute visuals. Nice idea!

I also got stuck in the boss arena.

The background was difficult to differentiate from the foreground.

Well, you've got a decent character controller implemented with all sorts of abilities functioning, as well as a bit of music and sound. All the components are ready to begin putting together a Metroidvania! Now onto the level design. :)

very nice game! saw that there a some things that don't work yet, but you have a great base for future development! I like your wall climbing too :D