Hiii, I've tried the steam version of the game and wanted to share some feedback about it :D, hopefully it is useful to you :)-The main concept of the game is really fun and interesting.
-The visual style of the game has that PS1/N64 days vibe, but it adds a little bit of extra polish and personality to that, I really liked it.
-The gameplay mechanics are pretty awesome and the way they are introduced at the levels to the player is pretty good, I'll just make the player have a little bit more of control over the character when rolling at high speeds in "rock ball" mode.
-The level design is very good and takes advantage of the gameplay mechanics pretty well.
-I'll add a customization system based on the "collectable bells" that can be picked up at the levels, that could engage people to play the levels more times or better.
In conclusion, the idea is great and I hope you keep working on it. Hopefully this is useful for the development :D, also if you could subscribe that would help me a lot :)