Various cheats
     Press [TAB] to bring down console, then type:

Cheat code:                  Result:
god                          God Mode
framesync                    Framesync On/Off
fps                          Show Framerate
give [item] Gives [Item]     See List Below

Item Names:

rocketl
minigun
nailgun
pulserifle
health
armor
ammo1
ammo2
ammo3