Haha, I fell off the world, I'm a nobody now xD.
Also, I loved the game, very informative and can be so helpful for a lot of people. Me, as a gender fluid person, found it very relaxing and like a way to understand me a bit more. And also I freaking love the non-Euclidian space games, it's really awesome and confusing.
Update: I've replayed it to test it out.
You can get there by entering the trans room, going a bit further to the stairs, just to make the first room to transform in the loop, and then go back to the cis hallway and go around it in the opposite direction of the arrow, a few times. Eventually the hallway will end in a wall and you can pass through it and fall forever.
If you go around enough on the direction of the arrow, you'll get the cis sign to disappear completely, but I didn't get to fall like in the other direction.
I haven't tested it with the rest of the rooms, I have homework to do xD, but I hope this is helpful.