Not to bad...
Although it could use some work, and if it is your first flash game I'll give 'ya some massive kudo's. But, as stated, some work you could do is extend the game and give a few more options here 'n there when it comes to the other survivors, like giving them a limited weapon selection of their own so grandpa off to my right isn't using a 9mm anymore. Also, if you were to, increase the game a bit, add more days or some kind of in-game game (bad pun). But, at an overall I'll say it's not to bad, just needs length.