We save your user to save your purchases and upload them.
We create an Android advertising ID and use it to give you the best advertisings
Your ID from Google Play is used to create a user in our DataBase to save your progress in the game,this and more data like: points,username,gems..
Another thing that we use is Unity Analytics:
In order to provide analytics for your games, Unity Analytics collects and uses in each game built with Unity Editor an anonymized user ID. Each ID is unique to users on each developer’s apps. These IDs cannot be used to track users across apps built by other developers and cannot be mapped between different services, devices, or even different browsers on the same computer.
To contact us: firstname.lastname@example.org