neat brainteaser! though some levels you could just mash the arow keys and it would solve itelf eventually.... then again, those are the begginner levels, so overal, good game!
Thanks! Indeed, the first 8 out of 30 levels are designed such that the player cannot make them impossible, so you could brute force your way through them. After that, the difficulty ramps up fairly quickly and a wrong move could make the level unsolvable.