Very interesting concept and art direction! I really like what you've done with the colors. Volcano was my favorite visual level. Sky had my favorite audio. The gameplay is fairly relaxing and care-free, but still makes you want to continue to see more.
The rainbow visuals on the last level hurt my head a bit when moving. and level 2 seemed to be the only one where it looks like the ball/level isn't even moving, but I did appreciate all of the other levels. Not that the game really requires UI of much sort, but it could definitely use some work, and audio could also use a bit of direction. It's such a 3d experience but no 3d sound to be had.
Overall, cool stuff, nice use of procedural generation. Trippy visuals if at times a bit overwhelming. My main suggestions would be to focus on UI and audio for future updates.