Galaxy Invasion

Galaxy Invasion is a clone of Namco's "Galaxian" arcade game written by Big Five Software founders Bill Hogue and Jeff Konyu for the TRS-80 16K and published in 1980. It is the first game from Big Five to include sound and music. "Galaxy Invasion" was followed by an enhanced version in 1982, "Galaxy Invasion Plus", which includes voice.
Gameplay.
"Galaxy Invasion" is a game of defending a lone missile base from alien ships.
Reception.
Jon Mishcon reviewed "Galaxy Invasion" in "The Space Gamer" No. 35. Johnson commented that "this is one of those very rare state-of-the-art game programs. A wonderful program. A better than wonderful game. Buy it immediately."