Great app but with a few touch ups would be an amazing one

Very easy to be addicted to this game it is easy to jump in and kill some zombies however, Im stuck right now any money I make I have to spend cooling my gun and buying ammo. This is leading me no where to upgrade my guns to allow me to keep doing missions as theyre getting really hard now. If like to ask the developers if they can cut the cost of ammo in half maybe the cost to cool down a weapon too but if they could add a survival mode that you can jump in at any time and zombies keep coming and get harder and harder until you die

Howieb23 about Zombie Frontier, v1.0