Space Defender
Space Defender is a video game for the Apple II computer, created by Daniel Schuyler and published by Bel-Air Software in 1982. It requires an Apple II computer with a minimum of 48K RAM.
Description
You are the Space Defender. Your mission is to protect your Star Base from attacking aliens, fireballs and start pods. If any of these objects collide with the Star Base, the Star Base will be destroyed.
You will start your mission with three ships and each time you sustain a hit you will lose 20% of your energy. A warning alarm will sound when you ship has only 20% energy remaining. At different point levels your shield will automatically be recharged by drawing power out of the alien ships. Your laser will also fire behind you in case an alien gets past you.
The aliens are stronger than they seem. Each alien ship must be hit by your laser 5 times to be destroyed.
Your mission will get harder as the number of alien attack ways increases. The attackers speed will increase and there will also be times when you'll be able to see the aliens only when you fire!