Sweet!
Awesome game man. If you're planning on making a second or updated game, I have a few suggestions for you if you don't mind :P
1. Allow yourself and other survivors to be named.
2. When you search for weapons/survivors, you could have a mini game where you get ambushed by zombies and you (and your survivors that you take along) have to kill them to proceed. If a survivor gets bitten you loose that survivor.
3. Different modes (Slow, one-head shot-kills/fast, high health mobs/Etc.
4. "Search for supplies" to support your number of survivors.
5. Slightly better AI for survivor attacks, having them is supposed to mean I still should be doing all the work. Most, but not all.
6. The human body needs around 4-8 hours for sleep to function normally, perhaps there would be a way to implement sleep and the effects from choosing not to spend hours sleeping?
7. Grenades, with splash damage ^_^
8. Tweak the aiming just a tad, it's not broke, but it could be better.
9. A level system is a possibility too, but not in the least bit necessary
10. Keep up the good work, for your first flash submission, this piece is better than some of the stuff that comes from 1-2 year regulars.
Good work :)