Oh that's right, I forgot to give my review of your TDM map!
Artwise, compared to your previous work the inside of the station's it's pretty lack luster with no neat little details like halogen lamps on the walls or a background of any kind other than a dark grey/green wall. Considering how awesome Contra looks, I'm guessing that you're not done making this look pretty, especially when compared to how great the outside background looks in comparison to the inside. I guess I can't say much about the art at this stage in its development!
As for the map itself, those dropdown platforms got in the way a lot of the time. I would be wanting to simply jump over someone and I'd end up jumping onto a platform. It's especially annoying when playing KZ because the crouch ability is also S, so you have to freeze yourself in place when on a dropdown area, which made me a pretty easy target. Since she's not the only character that uses the S key in some way, this might become a problem for them too. The subway cars were the most annoying area because their dropdown platforms are so close to the ground that even the slightest jump would send me up to the second platform when all I wanted was to avoid their shot or jumpshot at them. Even if I weren't playing KZ, this would still be a problem because I'd have to repeatedly keep jamming S on my jumps in the middle of a fight. And honestly, I agree on its size. Though I believe the map's layout is well designed, it's so big that I found it hard to find or keep track of my opponent in it.
For suggestions for improvement, considering how all the other TDM matches have something different and unique that can kill you in them (like the acid in one map, the lava in another, or the electrified room and flame walls in the other one), it wouldn't hurt if maybe you put in some special map specific hazards to spice up the map itself. Maybe something like a busted faulty traincar that slams back and forth and crushes you like an elevator would? In my opinion, it would also be greatly appreciated if you removed at least a few of those dropdown areas and mainly use them around ladders and train cars. They're a good idea, but when they're all over the place it makes navigating it a bit of a bother when you're forced to mash S half the time because you didn't actually want to go up there.