I like that it's full 3D.
From an art perspective it's nice that you build everything out of spheroids. That works on two levels -- fitting the theme and also economizing art work in a time-limited jam. Looks pretty too.
I found it a little frustrating to judge how big the player's bounding box would be. I think that might work a little better in a third person perspective.
Nice that you implemented sound even if in a basic form, that tends to get overlooked in short jams.
The swapping-colors mechanic is a little cliched these days. If you want to continue with this (and I think you should!) I would ask what else new you're bringing to the table.
Good stuff though!
Hope that helps.