Ikari Warriors
I tried out the NES version (but based on what gameplay footage I saw, the Atari and arcade versions looked to be the same game, just different graphics).
A vertical-scrolling shooter with a top-down view, there's nothing about this game that makes it stand apart from a plethora of other types of games from those days. I also found the controls to be substandard which made the game harder than it needed to be.
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