This map was really fun!

Dig the gravity effect on this. If only dosh came out of the boxes if you hit them with your head.
Would love this map more if it was a bit harder. The trader spot is too easy to hold. Should maybe have zeds spawn above if everyone is below.
Not too much of a problem as I think people would be more inclined to hold above, but if a team holds at the trader, it can make the map pretty boring. Alternatively you could add gaps in the floor (that you can hop over with the gravity, like in Mario :P).

Glad you made one without the loud music but you could have just turned the volume very low..

First off, how do you expect anyone to download your map without pictures of it? Second, your map is not good. You should hide entry points better so it looks as though the Zeds are coming out of the pipe, not a air duct attatched to the inside of the pipe. The scale of things are off and the bottom of the level is boring and empty.

There should not be that many ? blocks, you could try to use one as the trader and place it around the map. It also would probably feel better if the map was smaller and better planned out.