Amazing
One of the best puzzle games I've ever played. It was so simple, and yet so challenging. Trying to find out which pieces had to be where were very interesting. And going through the many complex combinations in order to move that one single piece was fun.
Also, I thought it was clever how you had some of the levels spell words out like "easy", and I think I saw "game" or something.
Well I hope you continue to make great games!