Challenging
Because of the lack of clear instructions, it took me a while to work out what you needed to do, but once I'd figured it out, it turned out to be quite a fun and challenging game.
I noticed this was blammed recently, and thats probably because most people couldn't work out what to do, as the first level is very tricky if you don't understand the concept of the game. It didn't help that the few instructions you left were hidden behind the blocks which we were supposed to move. If you give the game some much clearer instructions then this should get a pretty decent rating.