This was super effective. I love the use of a cyclic structure with miniature diversions in choice to emphasize that no matter what you do it will never end and you are doomed to fall forever. The graphics, writing and sound design all played so well off each other that I even shivered a few times. This is a really exemplary example of atmosphere in a text based game.
The only thing you might want to do is add a flashing images warning for people who are sensitive to that.