I don't know them all but burn:cycle, i have no mouth and i must scream, metal gear solid, hydrophobia: prophecy are cyberpunk games. Dead Space is also cyberpunk as much as the first Alien movie was, probably a little more since at the end of the game some kind of new being awakes or is created (which would happen in the archetypal cyberpunk story). Ofc, dead space is nothing but a clone plot wise with lots of shooting and hallucinations...
As far as i'm concerned themes like cyberspace, drugs, totalitarian/crime/conspiracy stuff, corporations, superior beings are what make cyberpunk the way it is.
Violence, settings and characters who feel some kind of psychological freedom like hackers, ninjas, noir cops (and runners in mirror's edge case) are an addition to me, though i prefer post cyberpunk stuff in general..