Hmm,how about something like.A whole building is filled with zombies.And your playing as a zombie slayer.You have to travel out through each level within the building and kill every zombie that gets in your face.And you work with some kind of goverment thingy or like you have your buddys lab that is equipped with loads of weapons!And you get to carry like 5 or 7?And at like the top of the building.You battle the Zombie King and the Zombie Queen.But before that.You have to battle with a half zombie half devil kind of person.
And then you have a mode where you can die in 1 hit.Hell or Heaven(Copied from Devil May Cry)Lol..Stick May Cry
And you get to upgrade your body armor thats cool and stuff.You get to do speed kills and at the 2nd last level as I said.When you battle the half zombie half devil kind of person,you fail.But,you don't actually fail.You start hitting him and stuff but it dosen't do damage and you get damage with one blow from him.Then you get like half life.Then he bites you and you go beserk.You get like aura around you and you get like a glowing white thing outlining your body and everything inverts.(Most of the ideas are from different games I've played)and the game play gets like double screened when hit.
Yeah basicly thats what I'm thinking about the game play.
You need to rethink some basic principles in your life.
Classes:
Hunter - Medium Speed, armed with a rifle and 9mm pistol, medium health medium damage
Ranger - fast speed, sniper and knife, medium health high damage, but hard to play
Marine - Low speed, Ak47 and glock, high health high damage, hard to kill and pure awesome
Citizen - very High speed, crowbar/baseball bat, medium health, low damage
Veteran ( Unlockable class ) Medium speed, G3 and Ak47, high health, high damage
Dealer ( Unlockable class ) High speed, knife, high health, low damage, but just freakin awesome
Priest ( Unlockable class ) Medium speed, 12 gauge shotty, very high damage, low health
Infected ( Secret class ) High speed, hands and teeth, very high damage, high health
Brute - low speed, fists, extremely high damage, extremely high health
Badass ( Secret class ) Extremely high speed, awesome rays, infinite health, extremely high damage, and filled with epic to the brim
Oh, and a ultra secret
MEGA MONSTER ( Extremely secret class ) Amazingly high speed, auto-kill damage, infinite health, and MASSIVE.
Weapons :
Hand variety : Knuckledusters (2 damage), spiked chains (5 damage), Fists ( 1 damage )
Weapon variety : Crowbar (4 damage), baseball bat (4 damage), stick (1 damage), log (15 damage but only one use), knife (6 damage), stake (4 damage), chain (4 damage), bone (1/2 damage), plate ( 3 damage, but prone to smashing, on smashing it deals an extra 10 damage), and then we has cups, which do (4 damage)
Guns: Ak47 (7 damage ), rifle (30 damage), sniper rifle (40 damage), G3 ( 10 damage), 9mm (5 damage), glock (5 damage), 6 mm (3 damage), desert eagle (8 damage), Uzi (3 but extremely fast), nailgun (20 damage)