Game breaking bug:

The metal part of the back wall is portable - because of this, I beat your map in about 20 seconds on my first try.

I enjoy this. [spoiler]It took me a bit to see the gaps in the walls, and took some time to get to the cube. Haven't figured out yet what is done with it.[/spoiler]

At the entrance, just after you walk out of the elevator, there is enough of a gap between the walls and the elevator to see out into nothingness above the elevator.

so i just got your maze. fun

[spoiler]
After futzing around with the cube for a while, the phone rang and so i decided to start the level over. i shot down the camera near the start, used that to climb onto, and rapidly finished the level.

personally i don't think you should take out that solution because most people will not notice the camera in time for it to be helpful.
[/spoiler]