Summer Championships Semi-Finals Games 2-4

Over the last two days I've continued my Semi-Final against a marginally higher rated opponent in my club's Summer Championships from my age group. The format is a Knock-Out tournament (starting with the Round of 16, after the top 16 players have been chosen by a Swiss Tournament), and I'm playing in the Semi-Finals now.

As you can see from one of my previous posts, although I won my Round of 16 match and Quarter-Final match by scores of 4.0/4 (4-0), I lost the first game (where I was Black) against my opponent. He basically outplayed me in the later half. Here's the second game of the match; please analyze it with your advice.

I was extremely pleased to have won a long and quite difficult game. However, with the scores tied 1-1, Game 3 was the real test of my ability, as I would be playing Black again and would need to play exceptionally well to match my opponent.