I was confused on what to do and ended up crushing up a bunch of cats and the game couldn't handle it when I put the cup in it, thought it was humorous.
I tried replaying it the way it was intended, but the grape cat ate the juice without giving me any ingredients. I think the game would have been easier if the juice didn't increase it's velocity while being dragged.
It's a really cute game but the actual physics feels a little tedious.