Here are some steps on how to delete your save:
1) Navigate to your oneshot folder in your AppData (filepath should look something like "C:\Users\FutureCat\AppData\Roaming\Oneshot" but replace FutureCatwith your PC account name)
[Note: AppData is a hidden folder, so you may need to enable viewing hidden folders to access this directory if you want to navigate to it through file explorer]
2) Delete save.dat and p-settings.dat
3) Delete the save_backups folder