First of all: I like the key-mechanic of the game very much and appreciate that you took the real theme and not like many others said "the game is minimalistic", no in this game the player is a minimalist, which is awesome. Also the animation of the player is very good and underscores the movement mechanics. The only major issue is, that I got stuck in an area where I did not know how to proceed. Also it is fairly difficult to do precise jumps. Other than that you every now and then get stuck on edges, which is a bit immersion breaking since the player is a ball: I would not expect box-colliders with respect to that. Some sounds would have been nice as well, even just simple ones when the player moves and or jump.
I want to mention that my critique is much more on a high level and I am well aware that this is a game jam. I think that the core concept is cool and that the visuals are solid.
Cool project: keep making games!