I'm not sure how it would work if you are releasing a game with different parts that are played independently but use the same save data. But as long as the way the save data is located in the local storage is the same for all parts then if they're using the same port then it should work. And remember, it's the name that you set in Wapper that determines the port. And you can rename the EXE after building it if you want it to have a different name. Only the name during the build matters for the port. You can change the name of the EXE after and it will still use the same port.