Look's like your trying to cover a horrible build with 'block screen with craploads of annoying blood and gore'. The whole thing is a big box with some props and horribly done interiors, if you could call them that.
My, suggestion, break out of box building. For an application, a box build doesn't cut it. A few minor adjustments though, and it'd perfect. Good luck!
Effects are good, but you should have put the pub in the center of a field rather than at one end to make it more "surrounded."If you do that, add a road nearby for good effect.
Remember how I was there, sucon? To everyone else: Guys, interior detail will not matter when there are zombies running to you at the speed of light. It's the gameplay that matters, not the graphics.
1I was trying to get a good picture, that's hard to do with a crapload of zombies coming at you.