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Maybe you can provide a backup feature, just in case they use another computer, or clear the browser data by accident. For example, open a text box and show the saved string and allow the user to copy them. Or download as a file that can be imported later.  

Also localStorage is like cookie, so if you store something on a.itch.io/game1, you can't acces it  from b.itch.io, but you can access it from a.itch.io/game2. It depends on the domain name of your linked game.

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That's a good idea, and also a good point! I hadn't thought of access for different domains.