Not a comment on the gameplay, but the tutorial is far to slow and drawn out - experienced gamers could have this summarised in maybe 2 images with a line of text each. Maybe under a "quick help" link?
Edit: I'm tracking some basic stats, and it looks like 50% of those who start the tutorial don't finish.
Saying that you can need to put together the same or all different forms/colors/fills should suffice. Whoever doesn't understand that probably won't have much fun with the game anyway.