You did a great job with the visuals and audio; they are simple and pretty clean. Everything is supportive to the gameplay, especially visual readability, which is on-point.
I personally think level is too long and there's no checkpoint in between. I find it quite frustrating knowing my ball bounces off the wrong edge and fall-over especially near the finish line. Fortunately, the simple sound effects and overall sound design is pretty relaxing. The slowly moving abstract background also induces a feeling of relaxation.
When I play the game, I get an overall mixed feeling of cozy/relaxed and frustration at the same time. It is very fun to roll the ball fast in a straight line without falling though.
I played for 25 minutes before calling it quit at level 3 as I somehow just fall over and over near the end. Most of the gameplay time is spent having to start over from the beginning of the level on each fall.
Some small suggestions I would add is to insert some checkpoints, and add a small section on every level where it is safe to roll very fast. I skimmed over your devlog and you mentioned that the game is designed to be speed-ran. Currently, I personally find it very hard to roll fast and have to stop/brake all the time.
With some better level designs, I think the game has the potential to be fun.
I hope you keep on iterating between playtest and development!