Well, the game has a very good theme integration. The random ball-weights make it more interesting, but also kind of more a game of luck.
Adding some levels/challenges and graphical effects (particles for instance) would be good.
And (working) audio. I believe there wnt something wrong, as you wrote about music and soundfx?
Anyhow, congrats on making a game for the jam (in unbelievable 3,5 hours???)