Good job! You have managed to develop an awesome and entertaining game, I love endless runners/fallers, on this one my personal best is 30 :3.
I enjoyed the visuals, I think Amims advise is really nice, as having each layer with a different color would help identify better the holes.
The audio is amazing and very charming, I would love to fall for hours and hours if I get to listen to this jazzyness.
Congratulations for your submission, hope you do great on this jam!