Sorry to know that you can't find your save!
If you cannot find your game, try to log in with Facebook or Apple ID, in case your game was connected to one of these.
If it wasn't connected to an authentication method, don't worry, we will help you out! Contact us and tell us all the information you remember about your game.

To avoid losing your account, you can note down your Support ID, which is at the bottom of the loading screen or at the bottom of the settings menu.
You can also log in with an authentication method so you can safeguard your game in the cloud for a faster recovery!