Really cool mechanics at play here, and it's nice someone other than me made a platformer where you bounce around ;)
If you're gonna work on it past the game jam, I think the tutorial needs to ease the player in more. The ball mechanics are hard to wrap your head around and I got stuck in a few places until I understood what it's trying to tell me.
The camera also whips back and forth too quickly, and the parallax background also moves around too quickly which is a bit distracting. The part near the end of the tutorial where you can fall back in the water is evil, because I fell in it like 4 times trying to bounce to the top left.
I also had some issues with the bounce mechanic, sometimes when you let go it launches you backward, but sometimes I let go and nothing happens. It wasn't super clear why or when that happens. This game can be awesome with a bit of polish!