The app idea is great on itself. However, there are too many options blocked behind the pro version which one would think are basic: whitelist and exporting the progress (changing phones makes all the progress be lost). Moreover, although not essential, some free achievements would also be nice, even if they don't give any coins. I'm willing to change my rating if I see any of those changes, since like I said, the app is quite good already (free version feels like less than a free trial...)