The games saves aren't set in the usual place, instead they're saved in your windows registry. All you have to do is go into your registry, find the games save file, and rename it to something else, which forces the game to not recognize it and create a new one.

1. Make sure your game is closed before doing any of this

2. Open windows registry - in the search bar when you click the windows button type "Registry Editor" and open it

3. Go to the games save location - the location should look something like this: HKEY_CURRENT_USER > Software > SunCats > DestinedToDie

4. Rename the "DestinedToDie" file. I just added -old to the end, so it was changed to "DestinedToDie-old"

5. Open your game and voila, your progress should be reset