its awesome ! with only one problem，if there is an update, how do i transfer the save file to the new updated version?( on Android )
If you don't uninstall the game, it should be updated automatically when you download the new version, keeping all your save files.
You can also try to find where your phone stores the save files, and then copy-paste them in the same folder when you download the updated version. (If you have an SD card, it should be SD:/Android/data/com.onceinalifetime.program/files/saves/