This game has a really interesting core mechanic of scaling boxes big and small together. I agree with the others in that I would like to have seen some graphics polish (add a ceiling for the levels, spend some time on texturing work) and audio as well (there is no BGM, almost zero sound effects). Additionally, I would have liked to be able to scale the boxes with the scroll wheel, as dragging the mouse left-right is a bit finicky.
That being said, the concept of the game is very creative, and the levels are very fun to play, with different challenges in each one. Story is a bit lackluster, but for a game jam it's acceptable. This game has a lot of potential, and I'd love to see a fuull version, polished and expanded, in the future!