What did you download the beta? I wouldn't use it. It's total stuff. Unity doesn't support it and it likes to crash every five seconds.
I still use the stable version.
Uh, what are you talking about? Unity supports it the same as the "stable version." Its only crashed on me when I use it at school, but school computers are riddled with viruses and just overall screwed up, so I wouldn't count that.
Anyways about your game, it looks like a decent start, but I'm hoping the player model is a placeholder. It also reminds me of
Boxhead.
I also showed your video to my friend and he replied that it was horrible because zombies are way overdone.
Good luck on your project, though.