Wow, it got really difficult really fast. An interesting premise, though not being able to shove the boxes left gave me this constricting feeling like I was doing things with one arm tied behind my back. I may not be the puzzle game crowd though.
because there is only 10 levels so there is no much time to build up the difficulty, "maybe" I will update a 100 level version later and there will be more easier levels ≽^•⩊•^≼