Getting there!
Keep up the work buddy. I see major problems already (as you probably already know). Of course the ridiculous amount of money you start with makes things kind of lame, since the game is ridiculously easy to start with. The game is very slow paced over all. Not enough zombies appear on the screen at once, even on the hard difficulty, even at the later levels. Work on getting the difficulty and intensity level up and it will be much nicer. Also, certain weapons should have different effects. For instance, the shotgun should have a spread, so if you don't hit exactly in the head, but around the head, it still counts as a head shot. Another one: if the game gets much harder, perhaps make the mp5 full auto? Finally, a colt .45 should do considerably more damage than a .9mm beretta.