not bad. Two main problems: corridors too low and NOT ENOUGH HEALTH! Actually item placement was all a little bit off (e.g. proximity of RG and SG). consistent theme with some potential.
Nice Gameflow and architecture. Only thing I found strange was that the colourful lightning in combination with clean steel walls feels a bit "glamourous", but Quake2 style + glamour = ?*%&?
Hrm, I think I've seen this one before... IIRC there were a few technical visual glitches but it played well in a 2-level sort of way. Have to go back and check on this one again maybe.