Have you sad through the whole The End screen and seen the extra dialogue afterwards? I made a mistake in the coding and accidentally made it only unlock after sitting through the whole The End screen from the endings. I plan to change that next update.
It's 6 side stories that unlock in the Extras menu. The ones on page three. They open up if you've gotten the ending from not following Ted into the cave and also an ending from following him into the cave ^^
