Nice :D
That was one hell of a game you got going there. The graphics were very detailed and the action really keeps the player immersed. The journal entries were a nice touch XD
The only things I would recommend are:
-Wider selection of weapons
-Upgradable weaponry (Power, reload speed, etc)
-More Allies
-More powerful allies
-Choose the position your allies can take
-Upgrading Barricade
-Customizable Barricade
-Take part in weapon/survivor searches
-Improved aiming reticule
Great Game!!! Make this a series or something!