SlayerA:
Originality
Remarkable in construction, but fairly apparently-ordinary to the common-or-garden player.
Architecture
Some nice curving corridors and some big open stuff.
Texturing
Suitable and varied-ish.
Lighting
Decently bright, if not hugely artistic.
Entity work
Quite fiendish.
Impression
Really quite mad. Allowed the lift number effect, though.
Overall
A pretty unique map, to my knowledge.