You can ask for the AppStore rating right inside your app! A player will stay in the game.
Rate Inside App iOS is a native iOS plugin for Unity which makes it possible to call
Apple's native review dialog pop up from your C# code.
You only have to write one line of code!
More info about review dialog:
https://developer.apple.com/app-store/ratings-and-reviews/
Restrictions:
- it is for iOS only,
- iOS version must be 10.3 or higher.
(For the iOS versions usage statistics please
visit an official Apple site https://developer.apple.com/support/app-store/)