This is great! Straight into the game, instantly understandable core mechanic. Then I got stuck inside the tall tree for a bit. The groundpound mechanic is fun. The rainy level is hard!
The gaps you want to cross are usually big enough that you have to make a “bubble staircase” to get across, but the staircase has to be so tall that you can’t see how far you’ve gotten or if there’s a hazard where you want to land. Maybe if the bubbles could be pushed from the side, or if they flew a little bit horizontally when you spit them out, it would be easier to keep the platforms visible? Another option would be to have the camera look ahead of the player in the direction they’re moving, etc.
I love the art style!