Ah, I replay the game and press T to check the slideshow. I managed to score one point so far lol. On first try I only checked out the written description so I didn't fully get it.
I feel like some design choices made the gameplay quite unwieldy, like the decision to make you not able to "jump" on the box after a certain size, making the "sizing pads" stationary and you have to push multiple boxes back and forth, or unable to interact with the cubes anymore if you push them into the corners. Nonetheless, good job for finishing it and submit anyway. I hope you consider continue working some more on this game to make it more fun.