Nice idea for the story, cool art, and audio!
But maybe the story itself needs further narrative or something like a comic to express the idea better for us gamers. Another thing is, I was quite confused about what should I do with the marble at the beginning, making a guidance box for the game may solve this (and add the winning conditions!). It's also not clear about the game being a 1 or 2 player game.
Thanks for letting me play and good luck developing