Crystal Revenge is an arcade style game done entirely in BASIC. In it, your are defending the home planet (on the right), from waves of ships (a single one on screen at a time). If they make it to the home planet, they will blow up a city, or the whole planet. You are limited to 30 shots per wave, and there are 10 ships per wave. Each wave, the ships change, and they start moving around more on later levels, making them harder to shoot. You move your gun site with the joystick (digital style, not analog) to aim.
Title: Crystal Revenge
Author: Tom Roginski
Publisher: Owl-ware
Released: Likely late 1982. For sure January 1983 (1st ad Rainbow January 1983)
Requires: Color Computer 1/2/3, 16K RAM, Extended BASIC, cassette or disk, joystick.