I think 28 ... Kf6 would've allowed you to hang on longer. Then K to g7 or f8 as needed. Unless I missed something, then both of you have to waste time making queenside pawn moves for a while, and eventually I think you get into zugzwang, but that last part is just a guess.
But yeah, K+N vs K+B is hard with so much open space. N has a hard time against passed pawns.
But yeah, K+N vs K+B is hard with so much open space. N has a hard time against passed pawns.