Cute game! I am and will ever be a fan of The Incredible Machine style games!
The physics are a bit janky, there are times where i think the marble will change direction and it wont unfortunately. In example the corner of the eraser would let you think that the marble would change angle, but it won't.
And the tools are a bit hard to use, especially the first level for me. I didn't notice you could rotate stuff until level 3.
I like the audio compartment... BOING! xD
Overall i love the idea of this kind of game represented in a jam, brings good memories! :)