The game should start out easy! I had to waste like 3 clips just to kill my first zombie! =p There should always be a skip button in cut scenes. Have auto-reload and auto-fire! And You're the best we have, save the president's daughter and kill the zombies with this.... pistol. And you need to waste around 20+ bullets just to kill your first zombie... pretty easy!
To finish the game:
After killing the Zombie boss (The Carrier) you have to make your way out... in order words, go back to basement Level 1 and find the stairs that lead to the surface.
Solidiers don't deploy automatically when created, they just wait in your castle. You have to manually deploy them by clicking on the Sword Icon next to the Build Troops Icon.
Btw another bug... after you have been defeated, it still says Glorious Victory.