She was found! Tempest for the Atari 5200 first saw the light of day at the World of Atari '98 show in Las Vegas. The game was 90% complete, with only the Superzapper, a few enemies, and no collision detection.
On arcade machines, the game has revolutionized, taking the player into unknown, endless vector worlds. Tempest is a dynamic and fast shooter that deserves respect even after all this time.
The version for the Atari 5200, of course, does not reach a decent level.