Lots of bugs
Ok, so it's a good game...I'll give you that. I just don't think its quite finished yet. You still have some major debugging issues to work out.
So here's what I found...
I play survival for maybe 2.5 minutes and it says that I survived for 5 and gives me the codes.
So then I go into Kill Master and end up killing maybe 27 vampires by the time the entire game is over (but it says that I need 50). Again it awards me with the remaining codes.
vampires on the final level are walking on the top ledge. They hover about 1/4" below.
Vampires can be shot offscreen...and any items they drop can be seen but not reached. (by offscreen I mean the gun selection area).
Even when I don't turn the shells off...they decide to stop appearing.
So um...yeah. Fine tune it, and you'll have a really nice game.
I agree with Tom too, more levels would be nice.
Good Luck.