It's the perfect background game, been going at it while listening to podcasts, watching TV, etc. Getting a bit obsessed with trying to beat my highscore and becoming top tapper. Going to be pretty hard though, I've got 500k coins, and top tapper has 4 million.
EDIT: Well, fuck. The colours got all screwed up while I was tapping and I went to low battery, so I deleted and installed it again and lost all my coins. Brilliant. And the colours are still fucked.