The tutorial was a good call and well done. I tried giving it a run without the tutorial and got a bit confused about how to place down blocks, until I realized there was a dedicated button for it. Potentially allowing the user to place a block through double clicking as well as the button might make it a bit more intuitive and potentially a faster way to play. Outside of that I thought the game was fairly fun puzzle game. I can see this making for a pretty good mobile game. Great Job!