Far too many ads. It's very distracting when you're trying to play, only to suddenly get an ad pop up that lags and won't skip when you press the x. The game often lags, and sends the miner where I don't want to go, even if I'm not touching the screen. The boosters that pop up are distracting too, and mess up my game. On top of that, the app would often kick me out to my home screen, and I'd have to reenter the app. It's so bad I want to give a 0, but that's not possible, so I give it a 1.