The biggest thing I have to say is the physical are really weird. Since you are forced in a ball, slopes makes what is made to be easy to get up places (like smaller parts with golden stars) so annoying to get out of since you need momentum and it's lost so quickly. You can take damage right after getting hit, which makes the starting puzzle of jumping on a bolder and moving it annoying with how easy it is to die. I feel like that type of thing shouldn't ever be in a first level let alone the first challenge. Like pic related, it's possible to get soft locked or later on in a smaller cave, if you loose momentum which is easy, you are forced to go into a spike pit. The graphics and music are great just please fix the physics.
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Thank you, this is one part great feedback on the physics but also one part you misunderstanding the game. Most of the parts that stumped you aren't design mistakes - they're puzzles you didn't solve or intentional obstacles that shouldn't be crossable. I made sure to avoid making puzzles that solve themselves, because those are something I wouldn't want to play. I'll work on tweaking the movement physics.