Incredible
This is your first flash game? You really got it nailed down, man, and you need to make more.
Only a couple possible knocks against this game:
- It's pretty easy, which I don't really have a probem with because this game is more about the zombie slaughtering than the challenge of gameplay.
- It's fairly laggy, even on low quality graphics; of course, my computer's getting on in years and it's probably unavoidable (admittedly, I wouldn't really know).
But seriously, there are a lot of cool concepts in this game. My favorite is how you can find survivors who not only help you repair the wall but also stand next to you and fire away at those undead bastards. The AI is even decent, although they aren't as good as the protagonist when it comes to laying down a crap-load of lead.
Weapons are distinct, fun to use, and sound pretty good. Zombies aren't terribly varied, but there's a decent mix. The game is also balanced nicely; you get all the weapons and survivors with a couple levels left to reap the rewards. I also liked that there was a short end cinematic-esque bit, as well.
What can you do to improve? It would have been cool to see a sort of "boss" zombie at the end, but this is great work. Make more.