Zeus

Zeus is an original arcade game, where you a wizard battling Zeus (the god), armed with a "Cone of Cold". The first 4 rounds, you have to shoot lightning bolts that come at you; starting on wave 5, there are clouds added (and they later start moving) that you can't stay under for too long. You have a power indicator, and the more often you fire, the more this gets used up (and the shorter range your blasts have), so you can't just fire constantly. You also have a shield, but that doesn't last forever, either.