Great puzzle! The simple idea is very interesting. I love the level progression. However, movement with WASD is a bit tedious. I think drag and drop with the mouse cursor would suit it better.
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Thank you for the feedback! It takes a while to push the boxes around, I agree. Perhaps tweaking that to be faster would help. I thought about drag and drop, but the idea is that in a more final state, the game will have environmental elements such as moving platforms. Perhaps drag and drop is a better idea.