Your save — progress, coins, settings — exists only on your device. Open the game → Settings → Reset save, or simply uninstall the app. Nothing of it is stored with us.
If Share play data with the developer was on, anonymous gameplay statistics were uploaded under a random identifier. They are deleted automatically after 90 days. To have them deleted now:
Switching the share setting off stops any further upload immediately. If you have already uninstalled the app the identifier is gone with it; the records then expire on their own within 90 days.
Rewarded videos are served by Google AdMob. To reset or delete the advertising identifier Google uses, use your phone's settings (Android: Settings → Google → Ads → Delete advertising ID). Google's own controls are at myadcenter.google.com.