Quite a coincidence that I see this tonight. I was on the bus today and noticed someone playing a game on their phone, something simple where you have to trace over a pattern as closely as you can. It was frustrating to watch because every time the user wanted to repeat a level or move on to the next, they were forced to tap through a couple of intermediary screens with flashy stats that took up as much time to get through as playing a level. Contrast that to this game where starting over takes me 0.0 seconds. You jump right back into gameplay, forgetting all the frustration that came with messing up on your previous attempt. More games should take note.