Fun little toy (I don't know if I'd call it a game at this point). Not sure how you'd turn it into a game, maybe a game where you have to make a particular statue? And it rates it based on how close you get?
For the circle shape, it looks like there's some small amount of background alpha to it, because if you click enough times in one spot you start to see a square around the circle. The shapes also get blurrier the larger you make them -- would have been good to have them at a higher resolution and then downscale rather than upscale.