It was really well designed. On the development side of things. The characters feel a bit floaty. Maybe try playing with the gravity when your player is falling. The controls also felt a bit unresponsive at times which became frustrating. I really love the art style and music you used! The levels were also really cool. Well done!
It would be cool if you could check out my game too and give it a rating. https://itch.io/jam/brackeys-5/rate/925013