Astro Defender is an exhilarating space-themed arcade game that puts you in command of the ultimate planetary defense system. The fate of Earth rests in your hands as you face a relentless onslaught of asteroids and small planets hurtling towards our beloved home planet. Armed with your trusty spacecraft, you must utilize your mouse to navigate the cosmic battlefield, shooting down these celestial threats with pinpoint accuracy.

Your mission is clear: protect Earth from these space intruders for as long as humanly possible. Each level presents a unique challenge, with varying quantities of ammunition to maximize your hits. As you continue to thwart the celestial invaders, you'll accumulate extra points and ammunition at the conclusion of each level.

Astro Defender offers an array of exciting features to enhance your gameplay experience. Choose from three distinct types of spacecraft, each with its own strengths and abilities. Customize your space arsenal with three types of lasers, ensuring you're well-prepared for any cosmic encounter. Deploy the protection spaceship to shield Earth from impending disaster, and collect life improvements to extend your game longevity.

With a total of 10 action-packed levels, the game promises endless excitement and challenges. The competition is fierce, and the player who can amass an impressive 1,000,000 points will secure victory. However, be vigilant! Failure looms on the horizon if Earth is struck three times or if you lose all your lives thrice. The fate of our planet hangs in the balance, and only a true Astro Defender can rise to the occasion and save the day.