So great! Maybe I missed the obvious while I was poking around, but where is the game data saved? I'd like to sync it to the cloud to go back and forth between my PC and Steam Deck. So happy this exists :D
This game was made with Unity, and the save file is in the default location. On Windows, that is:
%userprofile%\AppData\LocalLow\<companyname>\<productname>
You might have to enable viewing hidden files to see it. For This game specifically it's:
%userprofile%\AppData\LocalLow\LucasPucas\ShyGuySurfing
If you pop that in Windows explorer, it should bring you there :)