Doesn't look like 11...f5 was very good. Perhaps 11...h5 and if 12.b4 h4 13.Ne2 h3 14.g3 Qg4 may be better than what Black played. When both sides castle on opposite sides, the first one who gets a successful attack on the side of the enemy king usually wins.
Converting a positional advantage
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This game I recently played as white here on chess.com really shows the advantage of active pieces. Although my opponent did not make any great material blunders, the positional advantage I had coming out of the opening proved to be decisive by moves 15-20
Any tips or constructive comments would be appreciated
Enjoy!