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I think the idea is really cool! I personally think that a lot of the levels when the blue box is first introduced feel kinda the same (shoot bullet and then move to the spot where you want the box to go.) Maybe you could have the blue box and the box at the beginning of the game that you can push around in the same levels earlier on to mix up the levels a bit? Anyway good luck with the game it seems like it has a lot of potential.