100% accuracy bullet game

The opening is one of my favorites: Giuoco Piano Game: Main Line, Giuoco Pianissimo Variation. My opponent just blundered at the 9th move. Until then the game was equal despite the fact I was up a pawn. After the fork he just resigned, but it was too early, he should have continued the game. It was a bullet game so he could have just tried to flag me even if I played accurately keeping my advantage.