I really can't apologize enough. It was a careless mistake on my part, and even though I managed to fix my mistake within minutes of the update, the fact that Itch.io doesn't support rollbacks in builds, meant the save file would get deleted, no matter what I did.
As compensation you will unlock all the routes (what is available so far), but you will have lost your own personal progress such as kind/fierce points as well as custom outfits. I understand if you do not wish to support anymore due to this mistake.