Currently, your game data is only stored on your device. Unfortunately, there is no backup system available. This means that if you switch devices or uninstall the app, all your game progress will be lost.
The good news is that the achievements you unlock and the scores you achieve are securely saved in Google Play and Game Center. These achievements and scores are kept separate from the game data itself. So, even if you experience a device change or uninstall the app, your achievements and scores will still be preserved.