I… completely overlooked the recover files button on the home tab.
I was looking for some kind of recovery option through the file menu.
I knew that aseprite kept file history for an unexpected shutdown/crash, but I was under the impression that if it was shutdown manually (and saved in error as in my case) these were purged. Clearly this is not the case.
Thank you so much. It did have a recovery point for my sprite sheet before the overwrite. So yes – now it’s officially better than GIMP in all respects.