Really cute game with a fun concept! The art is super cute! I have feedback but hopefully it doesn't come across as negative.
1. The upscroll feels fast, when it's about the right speed mechanically. Maybe slow down how it looks a little?
2. A faster way to get rid of marbles would be nice, not sure of an elegant way to do that though.
3, Maybe after the first time you use a marble on a thing, the next time you hover a marble over a thing, the tool tip shows you what stat will change to what? Keeping track of what 32 marbles do is a lot and any marble which reduces charge speed is basically negative.
Anyway, really neat game. Great job!