Finally I got demo to work, and also my game. Thanks, everyone. It works nice in <3316 challenge>. I just uploaded it, so it would take some time to be applied to the Play Store.
Tip 1. Don't minify your script when exporting.
Tip 2. You can't preview it before signing and zipaligning. So integrate it after finishing is done.
Tip 3. Make sure that the setting of CJS Plugin is 'Google Play Games'.