> ALERT: Flying saucers from deep space are attacking our moon bases.
> You have been called into service to fend off the alien
> transgressors. Using the mouse, aim and fire rockets from your two
> rocket cannons, to destroy approaching saucers. Saucers that get
> past your defenses will plant alien pods inside the base. The pods
> will eventually attach themselves to the ceiling and begin to grow.
> Using your trusty laser pistol, you must destroy the growing pods
> before they mature into adult aliens. Your laser pistol will not
> fire in the stairwells, or in the elevator shaft. Plan accordingly.
> The adult aliens are less than friendly. A negotiated settlement is
> not possible. Keep your laser handy.
>
> In a 1-player game, each wave is separated into two segments - a
> saucer-attack segment, followed by an alien-extermination segment.
> In a 2-player game, the saucers and pods act simultaneously. One
> player must man the guns while the other player patrols the interior
> of the moonbase. Extra commando every 20,000 points.

. . --- in-game instructions

Download #1: v1.0.4
Download #2: v1.0.3 Demo
Download #3: A [Buck's Serial Number Generator (BSNG)][1] plugin to
generate registration codes.

Compatibility
Architecture: 68k

Full version will not work in emulators except QEMU or MAME.

  [1]: http://macintoshgarden.org/apps/bucks-serial-number-generator-bsng