First of all, when you use the teleport, the source fog is spawned, so you can see yourself teleport back to the start. I don't think that's desired..
The "color results" triangle is chainsawed into a metal panel and honestly it feels like a really
grinding cutoff if you ask me. The shape is cool, though it needs a better base texture that's for sure. Could also use a light gradient - from darker start to bright finish.
Thirdly, I got the slight feeling the area feels a little too real.
While a simulation #2 would hamper the uniqueness of the yellow keycard simu IMO (totally not biased here, folks!), it could feel a bit more surreal. I mean, it's a teleporter maze! That stuff isn't natural!
Though I don't know if we have enough resources (aka slots) for this kinda stuff anymore.
The megasphere at the end isn't tagged as a secret and TBH I think it's not rewarding enough. Maybe put the BFG in here?
......... y'know, I got a crazy idea, it actually makes sense to me if this area was locked with the keypad thingy. Though, for a double puzzle, you need a double reward!