Your city has been besieged by hostile soldiers. They've captured you, a member of the resistance, in the middle of the night, but you manage to escape by jumping off a truck. Now you'll really have to fight for your life : it's a kill or a cure, so shoot as many soldiers as you can.
Use W to jump, S to crouch down, A to move left and D to move right. Q = previous weapon, E = next weapon.