Falcons (http://www.mobygames.com/game/apple2/falcons) was an action game published by Piccadilly software in 1981 for the Apple ][. It was a simple shoot ’em up with 5 stages that repeat indefinitely. Hope you enjoy the longplay!
PS: The # of lives is stored at address 0x4FC. The timer for using the shield is stored at 0xED and the timer for recharging the shield is stored at 0xF1. I modified the code so that I got infinite lives with zero recharging time for the shield.
Cover art: www.mobygames.com