I think that save files, like in other Unity engine games, can be found in AppData folder, at least in Windows. For this game, the path is: "C\Users\[Your_user_name]\AppData\LocalLow\Fishlicka\Juice World".
By Windows explorer, which you should already know as you already extracted the game. But you need to enable hidden files in "View" tab, in order to be able to see Appdata, which is hidden folder.