Something that had bothered me in the back of my mind, as well as being the main thing that had me put off playtesting for a while, was trying to work with the tiny amount of five save slots. The reason for having such a low cap at the time was because the script I had used in the demo (CP Luna Save) turned out to have a possible bug where it can't scroll down to show other saves. It wasn't until recently that I figured out what to do about it.
So after replacing that with the regular Luna Engine save scripts and making a small overwrite snippet, the save screen has now been updated with a slightly changed layout and a new maximum of 99 saves!
(I know it shows the incorrect frame of the walking sprite, but at least it works?)