Masterpiece.
Gotta say, that was the best defence game I have ever played!
I loved the idea that survivors actually do something.
The idea for not having to buy the guns was good too! The day time thing was awesome idea.
The ending could have had some more animation, like the survivors would enter the copter and stuff, but thats just an minor point, the ending was awesome.
There is a glitch thought, when you reload your gun and go to options menu, the everything else stops but the reloading, so when you resume, you have a fresh clip of ammo.
Awesome game.