There's two versions of this. The old one is compiled in The Games Factory, and looks wierd if you aren't running at 800x600. The new one is re-saved in Multimedia Fusion 2, and looks a bit better.
Either way, back in the day The Games Factory allowed you to make screensavers. But also screensavers always automatically ended if you moved the mouse, which made a click-shooter a no-go. So I just re-saved it as a normal game.
OLD
NEW