I wish I could say it was fun, but there's a few problems with it I'd say.
One, as mentioned in other comments, the satisfaction drops way too quickly. Between the time I can dump my balls and get another bunch of big balls, the satisfaction's already shrank to zero.
As well, what to actually do was unclear. Collecting the balls was self-evident, but knowing what to do with them was very unclear. It wasn't until one of the balls glitched and flew out of my cauldron into the dump-zone that I realised what the gameplay was.
And finally, some pre-warning of where the balls are dropping might be good, like a little light indicator a second before where from the top the ball will drop. It was always super annoying to see a ball falling on the very edge of the map, and not even having a chance to get to it.
I like the stubby, jerky movement of the cauldron character, it makes them feel more like a living entity rather than a gameplay thing. But the ball-dropping mechanic needs to be changed to make it actually enjoyable.