Four losing pawn moves - how hard can it be?

An entertaining tussle againt a player slightly more consistent than me. A loss of a pawn put me on the back heel for the entire game - and then I failed to analyze the position and blundered to a loss. But still some interesting ideas here, at least for me. I made no less than four losing pawn moves, according to Fritz.

(These blogs are a way of learning from my own mediocre games)