pet peeve
my greatest pet peeve with newgrounds submissions is when a game just launches you into play, no title screen, no instructions, no notion of what the hell its about (yeah, I know you got the author comments, but I believe a game ought to be self contained - after all, is ng the only site this game will be on? Will there be comments for you to leave everywhere it goes?)... its disorienting and says you weren't willing to put in the extra little bit of effort to put the finishing touches, the professional packaging on it.
People will think this is petty -- but its not, this is an important design principle.