Neat concept, and good music vibe to go with it!
One comment I have is that it's really hard to control my character. I tried holding and tapping the arrow keys, and then the ball would start bouncing (is that intended?). When I tried to roll backwards, the camera spun around me and he would turn in a direction instead of moving straight back like I assumed. I wasn't expecting that, and I thought I could use S to just straight roll back to make adjustments. It seems like there's always a direction being applied, but it would be nice if it would wait for player input before starting movement, especially at the start of a level (perhaps consider adding friction so it always slows down and the player isn't trying to move - if on a hill, totally fine to roll down until it's at a flat surface).
I couldn't get past the second level on skill alone, but I like that I can just choose a level from the beginning so I could try out the others.