Game looks really good, i love this minimalist style with a cute character that has a satisfying squash and stretch animation.
Quite a clever interpretation of the theme, good job.
As for wall jumps and edge collision people already said what i think about it.
Past that the only issue i had is on the last level. Collecting two dices in a short succession will bug out rotation animation. (Are you using AnimationPlayer for rotations?)
Overall a good game, albeit a bit short.