Just one extra move

I recently played a game in which I was Black. In the game below (which is already halfway into the game), it was my turn, and by Nxf6++ I won the game. However, I took back the move and I let ny opponent move instead of me. Naturally, he went to defend f6. After many moves, I lost! This goes to show if you were given just one additional move,and you are a decent player, you can turn the tides. Any comments on how I could have made a better move and won is greatly appreciated.Thanks!!