The developer released a new version of the game on Oct 15, 2019 and over 1M users downloaded and set up Coin Princess. Pay attention to the important moment: ads are a part of this application and it provides in-app purchases. You can get the setup package of Coin Princess 2.2.1 for free and read users' reviews on Droid Informer. The app works fine on Android 4.1 and above.
From the users' point of view, the advantage of Coin Princess is a good price, although some people state that the weak side of the app is video advertisements.