The user://
path should work with published games. I've used it a few times, and it seems to work fine.
What issues are you having? Is the file not saving, or is loading not working? Have you checked the user://
directory on your computer? If I recall correctly, on Windows the path is User/Appdata/Roaming/Godot/GameNameHere/
, and I think Linux stores it relative to the home directory? I'm not sure where MacOS maps user://
.