I forget if you do this already. I f it is not too much to ask could you add a message as the last screen that says something along the lines of "Now would be a good time to go back one screen and save for the next part." ?
I believe it's already there!There is a screen that tells you that you have reached the end of the available content.
Cool, It has been a little while since I got to an ending so I did not remember.