For the demo, save data is actually stored in the prefix for ID 1690940. I'd edit it myself but there doesn't seem to be a manual override for this.
Talk:Deltarune
It's not wrong, it is a steamid for the game itself https://steamdb.info/app/1671210/
Demo has a separate steamid https://steamdb.info/app/1690940/
I know it's not technically wrong, but I think it would be best to change it (if possible) since the demo is currently the only available way to play the game.
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