Very fun game! The art is adorable, I really like the diegetic UI, and even though I sucked at not spilling the popcorn, I think I did okay! (i spilled the last kernel... i felt so bad)
I think some more immediate feedback from the customers would be good. I did some science to figure out if they always left happy with whatever you gave them or not and gave one an empty cup, and they didnt seem to bothered by it. Maybe the real popcorn was the cup all along.
Regardless, well done! I had a good time with it.