Donkey follies: Dude, Where's My Advantage?

Hi all,

I've got a huge backlog of horrible and humiliating defeats that I need to analyze, so I thought I'll post a few of them every now and than for your kind consideration and, if nothing else, amusement.

This game was played at a time control of 45|15. My opponent played a few unorthodox looking moves in the opening and even though my responses were not ideal, I though that I stood slightly better when we got to the middlegame. There, I failed to come up with a decent plan and saw my slight advantage evaporate as pieces got traded, until we finally got to a losing king and pawn endgame. My main mistake, I think, was move 11, when I decided to push my pawn to d6, where it turned out to be a huge liability in the end.