I love the use of music and polish in this game! It's really fun, and I really like the way the difficulty scales up.
The best way I can see this game improving is if it was rhythm based. Sort like a rhythm heaven type thing. So the people bop their heads with the music, and you not only have to give the right package but do it to the rhythm of the music.
Overall, a pretty fun, simple and short game. Hope to see you in more game jams! :D