In reality, you don't even need to do that. To play cubic jam on macOS is very simple. First install wine and play the windows version :))

Can you make a cloud which means when the user press a new button “save” then it saves the data to the cloud?

And when the user press new button “load” and it will load the data to the new update? (Requires login feature)

But it will pretty much impossible for you to do it, also bonus link: Cloud Save: Save Game Progress & Store Player Data | Unity