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Unlimited Lives: Enter "NZL" as your initials on the high score screen. Start another game and you'll have infinite lives.
Overkill Game Review courtesy of DOSGames.com:
Like shooting stuff? Try Overkill. Despite the name, it isn't at all gory. In fact, it's a space shooter in the tradition of Galaga and so many others. It features EGA graphics and SB sounds and music. The gameplay isn't extremely varied, but it has good control and can be fun to play.Download Overkill