EVERY scrolling shooter is a ripoff of Galaxian, circa 1979. Even if the idea is similar, that does not mean that a "ripoff" is not a worthwhile game and it certainly does not mean that the developer deserves less credit.
My Code needs three comments
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3/5 because enemies spend more time off the screen than on, fighter AI is poor (they like to run into mines at full speed) and the action gets repetitive very quickly