Nice work!
Every suggestion i had turns out it was already implemented and explained along the way, so kudos to that!
The game is simple, yet engaging. The only lacking part is the HUD which could serve to telegraph things better, like for example the current momentum of the ball, the current charging momentum so the player won’t have a surprise when they release the space bar, how much longer does it have to hold R (and that it is an option before the 3rd level) to restart, like a circular loading bar and how many jumps does it still have available (refreshing instantly while touching the ground).
Again, these are all in the realm of polishing an already great game.
It was a pleasure to try it out!