That screenie looks like... oh. It's a jpeg.
You do realize you posted a picture of an SGE?
Now, the actual level. It's not very good. I have no idea what to do.
I believe the alleged SGE was posted on the old forum, and Johnny said it was intentional.
You're supposed to go down, then go east, then continue to go east for the rest of the level, basically. You also need to find some secrets in order to get the best ending you can, but they're basically impossible to find without either playing through the level more than once or cheating. (If I recall, the location of one secret is hinted at, one is in almost plain sight, one is in a random place you might never look, one is in a place it wouldn't actually fit in reality, etc, etc.)