Some of the greediest game design I've seen in a while. On top of the usual bs (way too many ads, unbalanced difficulty forcing you to watch ads or pay for boosters), when you buy an upgrade with your game coins, you have to wait 15-60+ minutes for the upgrade to take effect. Of course, you could always speed up that timer by watching even more ads or using diamonds (which may be purchased with real money). Waste of time and money. Do not install.