Wow that was impressive! The art style is astonishing and the music is just so cute! I never played marbles before so I'm glad I could discover this :p
I got stuck because of a bug where the NPC would get stuck in a loop while trying to aim, they would aim back and fourth and never flick, so I couldn't get to the rest of the game. That was actually much more challenging than I thought!
Edit: I could only play the browser version because I'm on Linux, so a Linux export would have been nice. There were many visual glitches but that's my PC's fault, it can't handle 3D correctly (old PC found in the street by my uncle's son who I barely know lol)