Very fun game, and more 'puzzle dept' then loops of zen.
Still, what i don't like is that sometimes, multiply solutions are possible, at level 13 i could keep 2 piece unused, even trough i didn't get to dummies yet. Also, i stongly miss a 'mark squar' button that NetWalk and the likes used to have, so you can mark the pieces of witch you are sure they are rotated in the right direction, big need on bigger levels.