Second Update: I finally yanked it around level 350 because I got sick of losing due to a twitchy interface made for tiny fingers. A good basic concept. I hope someone remakes it with an eye towards good UI design.
Update: I've played up to level 316 because I basically like the game. But it's UI is badly coded in one very aggravating way that keeps making me quit. The gray background slips around if you accidentally touch it while trying to touch-adjust one of the circles. It's simple enough to change how the grey background picks up touch gestures. Yes, a two finger pinch should adjust its size, as it does. But there is no game play reason for the background to respond to a single touch gesture by slipping around on screen, wrecking a round of this fast paced game. So this is either a coding error, or an attempt to make the game feel highly fragile, and hostile to larger fingers. Original: I have played through 160 levels, and have found the bad interface the hardest part of the game. The background slides under your finger unless you hit the tiny targets precisely. Over half the time, this is what loses the game. So, while it begins as an interesting puzzle-game, from level to level, ultimately I just want to toss it because of its aggravating UI design. I like the basic concept, but I've never played a game so openly hostile to the wrong sized fingers.