Name: Encounter!
Platform: Atari 800
Region: USA
Media: Executable
Controller: Joystick
Genre: Action - First Person - Shooter
Gametype: Licensed
Release Year: 1983
Developer: Novagen Software Ltd
Publisher: Synapse Software
Players: 1
Programmer: Paul Woakes
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Encounter! is a fast paced arcade game set in a sci-fi environment which features fast moving three dimensional graphics. You command a probe vehicle with which you have to shoot down enemy saucers and homing missiles. When you have shot down the required number of enemies on one level (usually around 10-20) you get the chance to go through a "stargate". In the stargate you have to navigate through a hail of spheres coming at you at high speed. If you succeed you get to a new planet in different color scheme, if you fail you'll have to replay the previous planet. There's eight levels in total.

http://www.mobygames.com/game/atari-8-bit/encounter-
