Phew, that was good fun! Very nice atmosphere most of the way through. The only let-down was the future area (which was a big let down, if I'm honest - way below the standard of the rest of the level).
But it was good. Graphics, audio, plot and script were very good. I wish I'd dropped in on Mrs Soup a few times more - only noticed her dialogue later on.
I got very lost looking for Lab 1 - managed to find a floating painter first (I'm too lazy to insert spoiler tags so I'm talking in riddles instead). Got there in the end but other likely entries were more memorable than the actual solution, and the map made it look like its entrance was somewhere in or left of Lab 4.
Overall, a lot of fun. Very good level. Well done, all!