The concept of the game is good. But there are many problems 1) requirements. The requirements to unlock a new area and upgrade tools is very expensive. Without the rewards of watching ads, the game will simply be boring and endless grind for materials 2) Ads There is so much ads and I can't simply for 10mins without running into 5 or 6 ads. And top that these ads is causing the game to have lags and slow my device.