If you are playing on the browser version, this behavior can be normal.
Browser saves rely on local storage.
If your browser clears data automatically (for example, when using Incognito Mode or certain privacy settings), your progress will be deleted when you close the browser.
To avoid this, you can:
- Export your save and import it later
- Make sure you are not using Incognito Mode
- Check your browser settings to ensure local data is not being cleared
However, some Android browsers may block file access or downloads, which can prevent save export from working properly.
The most reliable solution is to install the game locally on your device instead of playing in the browser.
The browser version is mainly intended for testing or trying out the game, not for long-term play.