Hmmm, tried a post but I may have deleted it. Here goes again.
Hooray for big maps! I really like the sense of vertigo I get looking down into the abyss as the platforms spiral away. It does seem like there are some strange drop shadow behaviours, where a drop shadow appears on a platform far below the one that is casting the shadow, but you did say you were working quickly.
I'm positive I can find a use for these!
I was fiddling with the shadows and realized I was spending too much time on it. So I left them how they were. I realize there should be very little shadow or none at all, but I couldn't get that feeling of depth when one platform or staircase was above another. So I cheated and went with the strange drop shadows. I thought it gave more depth, but maybe I'm wrong.
I'm not sure that I can use these maps, but darn if they ain't cool to look at. Well done.