Fun and interesting little game. Although if I have to be brutally honest, it doesn't seem like there is much strategy to the game, I managed to get a decent score of 486 just by not moving the box. I think if you reduce the popcorn falling/slow the rate of popcorn falling, we would actually have to move the box to catch each popcorn and maximise our yield, and perhaps have to make split-second choices if 2 are falling at the same time. I think that might improve the game a lot, but for a jam this is fine as it is.
Sorry for the negative feedback, I'm the type of person that likes to choose honesty over positivity, but I hope you don't mind.