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So at some point I fall down and then land somewhere where I can't go right (because can't go up the slope) and the left seems to be complete blackness which I can walk into for a while, but nothing is there. I'm not sure if I was doing something wrong or not.

To get back up jump up from under the sphinx and press climb. I originally put a helicopter at the left bottom where its just walking into black. It was intended to use the other wildcard failing to win but I didn't finish the helicopter in time. In retrospect I would add a collider wall at the bottom of that corridor so you cant walk left there. So yeah its just a pitfall basically, and you have to jump up to climb the sphinx to get out:)