Ah.. that’s not good :-/
Did you check the tutorial? It’s this little slideshow that’s supposed to explain the goal. Maybe it needs to be updated?
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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.
There is a "drag" button if you hold shift, so it's possible to drag boxes out of corners :) Will think about how to make this more clear though!
Having a limited jump height is a deliberate design decision, to encourage combining the boxes into stair-like compositions. Likewise with the stationary sizing pads, where we want to create a more frantic back-and-forth gameplay, and where an important part of the player's skill is learning how to measure up box sizes from afar. But will take your feedback into consideration, the important thing in the end is to make a fun game!