Is there an error message when you try to save? Or what exactly happens? Do you see a save at first but it disappears later?
It just brings up the save screen. I click on one of them and nothing happens. I have tried to use the auto save function, but this doesn't work either. I have tried on both windows 7 and 10. This happens (or rather doesn't happen) with all this type of games. It's just that your game is the most enjoyable (and frustrating) one I have played, hence trying to get an answer...