Hey Matz, you played your opponent even except for one or two moves. You played quite well, but you made a big strategic blunder when you allowed him to play f6! You needed to exchange, either exf5 or gxf5... you needed to see that if you allowed him to play f6 your position would become intolerably cramped and he'd have kingside attacking threats you had to pay attention to... this would leave you no scope for attacks of your own... you'd be treading water, defending, waiting and hoping for him to make a mistake.
They say games below expert are decided by tactics, but this game is an exception... it really seems to have been decided by pawn structure and space. Not a game to be embarassed by at all, a solid effort... but a good game to learn from.
Matz