itch.io

Two things to try:

1. Reinstall the game, using the itch.io app: https://itch.io/t/46387/how-to-download-and-install-the-game
2. Remove you save data:
   1. on the Doborog splash screen, press S
   2. This shows the location of your save data
   3. Go to that folder and remove all the files