Ok, the game seems interesting, but I can't rollback, and more importantly I can't save. And I don't mean I can't use old saves, to be clear, I mean I can't work out how to save. The usual Renpy stuff isn't working.
Hmmm, not sure what to tell you, maybe your version is faulty? It's definitely working, no one else has said anything about not being able to save or usual renpy stuff.