I think this opening is called "The Piano". A pretty typical start to a king pawn opening.

Aggressive line.

? Passive move.

?! A bishop on the main diagonal for an awkward knight is probably a bad trade.

Also from here my pieces are much better developed. Even though I'm playing with black I've developed every piece except my white bishop and he has only developed a knight. A player of his level probably noticed that he had put himself behind.

Pushing pawns is a weak tactic in this situation, but he continues.

! Probably a mistake. Better off just dealing with the threat. Some players don't like being left with a knight against a bishop when queens are still on the board though.

! Aggressive but completely safe. His queen is on the wrong side of the action.

? Again, for some reason he tries to push his pawns. Without support pawns are fairly useless with so many pieces on the board.

?? Loses the bishop.