Unlimited health, ammo.
Humans are in the area and somehow got the idea they can stay. Time to teach them a lesson.
Of course they are no match for your fire power, but first you have to fight your way through the malfunctioning defences.
In short: Little guy + Big gun = Havoc.
A move left and D move right.
W or space to jump.
S to do a roll.
Use the mouse to aim your gun.