I know I'm almost a year late, but I believe it happened because the developer didn't sign their game. Signing a game requires a license, which costs money, which is why a lot of smaller games get flagged.
norton is a huge sellout. most of the stuff that software detects as a virus is only labeled as such because they aren't shilling out dough. my dads website for his business got flagged by norton as dangerous to visit.
