The save file is created using the PlayerPref system in Unity. AFAIK it shouldn't take up more than a few kilobytes so don't worry about it bloating your pc.
Viewing post in No Players Online jam comments
Well, when I deleted the folder in local low, it seemed to reset the game. So that's how I found it. About the space thing, when your trying to clear up space, getting rid of big things is easy, but when you have a mass of tiny files that have accumulated over the years it can be a real headach. You don't want to accidentally deleat something important.