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That is a vague description. But the Enterprise (saucer section?) and massive guns in front do ring a bell:
Side-scroller; fly a spaceship on bombing raids over enemy territory, dodging and/or shooting enemy ships and collecting power-ups; land (carefully) on your own turf; repeat. Graphics and sound quite good, but silly. The most fun, when you can manage it, is cruising along with auto-strafe and invincibility.
Awards: MacWorld Game Hall of Fame, 5 Mice MacUser Magazine.