Here's my take on it:
Leave it. Why? Because, NG is known for allowing it's users to express themselves no matter how offensive the content is. If it isn't blammed, then it shouldn't be removed. Obviously, someone liked it.
I'm not saying I agree with his message, or find his game entertaining. I'm saying it would be incredibly weak for NG to remove a submission just because some (or most) people find it distasteful. By the way, who is it hurting? Those who were offended by it had the option of NOT CLICKING THE "PLAY THIS GAME" BUTTON! It's not like the submission went out stalking victims to offend! My god...
Also, it appears to me as though the author of the game intended to offend people. He wasn't making a statement, he was just trying to be controversial. With that in mind, why are people so shocked by it? If you know someone is trying to get attention, giving him the attention is only going to fuel his behavior. You people are weak minded.
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-Brian