Although the enemy always has more aircraft than you, they fly in predictable patterns which makes it easier to shoot them all down. When you are born, you are invulnerable for a brief period of time. Whenever huge, evil fat men are about to die, they start flashing. Ninjas are common and fight in public frequently. You never run out of bullets, only grenades.
All shopkeepers carry high tech weaponry.
Money is frequently found lying in the streets. You can smash things and get away with it. If you find food lying on the ground, eat it. Operating any vehicle or weapon is simple and requires no training. You can overcome most adversaries simply by having enough quarters.