Here is my game : https://jossitch.itch.io/how-to-play-a-platformer-game
I played, rated, and commented on your game. Check mine out if you have a buddy and the opportunity:
https://itch.io/jam/brackeys-16/rate/4951824
Do note that it does require multiplayer, at least one other player should give you a good idea but 3 or more for best experience.
game is pretty interesting and has a nice art style it has a unique charm into it. gameplay is very straight forward at the start. it was pretty cool implementation of the theme WHHAHA. I will never trust another platformer again WHAHHA. game has a very chill and laidback music background and the sound effects is implemented really well you can really feel that you are bouncing and you are bouncy.
some suggestions. work on the UI abit more. check the UI layering? it sometimes break and some UI stay forever in the screen . make it uniform if you want them to stick on the whole level make them all stick and such. movement sometimes bugs out. in stage 4 I think that is where you get the key it says, there is a specific tile there and when you stand up on it you cant jump.
thats all for me. you did a very good job on this game I know that you have put in alot of time developing the stages of it. it was pretty nice. Congratulations and thankyou for letting me review your game