Very okay entry. I liked the world art you used, and the sprites were charming.
I also liked the different enemies you had, and the bosses were pretty simple but okay.
Sadly the main issue is that I don't think it's a metroidvania at all, it's a mostly linear game with basically no progression on your character, but that's just an issue as a jam entry, not on the game itself.
Other than that my only big complaint is that you probably needed someway of indicating the player's health