I really enjoyed the game, but i got really disappointed of the "bonus" mode. After that a player got all 40 levels completed you don't add difficulties or great changing in the game simply making him can't see the whole gameboard, you just make the game repetitive and boring. FOR 40 LEVELS. 5/5 before bonus mode, 4/5 after it.
I HATE the fact that i lag even i low quality and i HATE MORE the fact that if i select low quality on the next shot the game selects high quality again. For this 2/5.
Very good game, but 4/5 for 2 reasons. The first one, like Calons said before, you need to put the buttone out of the playzone. The second, you should give the player the possibility of choose the priority of clicking. In levels with a lot of polygons it sucks to wait for the right timing to click and then click a square instead of a circle.