So I gave this a run and I must say I enjoyed the map very much! It was a fun nod towards Flood Zone, and I really liked the Flood Zone Easter egg.
I ran into a problem with the blue key elevator, I tried putting a pipebomb down, raised the elevator, and then detonated the pipebomb, but I couldn't get the elevator to lower down again (this elevator only works if you're inside of it). Luckily I saved right before going into the elevator