Very sorry for the issue and thank you for reporting. We'll be invetsigating! Meanwhile, have you tried deleteing the app's playerprefs?
To delete them, open regedit by pressing the Windows key and typing 'regedit', then pressing ENTER. Browse to 'HKEY_CURRENT_USER\SOFTWARE\Unity\UnityEditor\SantaRagione\HORSES
(you will have to start the game from the beginning!)