You can also link your progress to the social network accounts you connect to the game. The current game version supports Facebook, Google Play (Android) and iCloud/Apple ID (Apple devices).
Just go to game settings (the gear button under your profile picture) and choose any option that is more suitable for you.
Please note that games that were downloaded from Huawei App Gallery cannot be saved right now. This feature will be added in future updates.
Important: if you delete/reinstall the game, or reset all the settings on your device, you can only restore your progress on your own if the game is connected to a social network. That is also the only way to transfer progress from one device to another.