Z
shoot'em up game for Commodore 64, 1985

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You pilot the Z-Fighter. By cybernetic control, your brain becomes one with
the ship and your every thought becomes motion. Destroy all attacking aliens.
Fail, and the known universe will be overrun by the bloodthirsty aliens. A
true shoot-em-up. The joystick controls all motion. Fire button fires.
Destroy alien encounters and score points. The higher the level, the greater
the challenge. The greater the challenge, the larger the points received.
After destroying 10 aliens, an energy unit will appear. If you destroy this,
you will free an energy capsule. Chase and collect the capsule to obtain
energy bombs.
Once you have gathered several energy bombs, you can blast a hole through the
moving force barrier surrounding the Transporter Unit. Create a large enough
hole and you will be able to warp through hyperspace to the next level.
Complete all 4 levels and the universe is saved and you are a hero.
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Some useful keyboard shortcuts
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[PAUSE] - stop/continue game
[F9] - quick load game state
[F12] - quick save game state (still stored after leaving the site)
[F11] - toggle fullscreen mode
[ScrollLock] - quick switch control ports
[PageDown] - make a screenshot (320x200)