Just finished playing your map - it's cool, for starters. Played as an assault marine, and didn't have as big a problem with killing the zombies as some of the others did (though I did sacrifice quite a bit of HP in order to do it). Overall my gripes are the same as those previously posted...
I love the idea of expanding on the existing lore. Unfortunately, the links to your screens in the opening post appear to be broken - any way you could put new screens up? I'd really like to see how the maps look so far. Hope this doesn't count as resurrecting a "dead" project.