Where did I go wrong?

Please analyze this game and tell me where i went wrong. From move 52, I felt that i could win, and then somewhere i blundered horribly.

I'm going to start with screenname selection.  Now, on to the game.

 

By move 52 black had already at least a draw.  White allowed black to win by not stopping black's passed pawn. White can draw by bringing the king back to stop black's pawn instead of trying to promote on his own.

 

White's earlier mistake is not developing the b2 knight or c1 bishop and consequently the a1 rook.

 

How about 34. Ra5 followed by 35. Rc5 for white, does not this win a pawn?

 

 White was hanging the e5 pawn starting at move 46. Black must have though his rook gets in trouble if he takes it.

 

 

To me, the main move that does you in is 47. gxh5+ which allows him to create an unblocked pawn.  Before that move you had the only passed pawn in the game and that gives you a lot of leverage.  I would have preferred 47. Kf3 or 47 Ke3, angling your King over to attack his Rook or at least push it off of your pawn.  Notice how even after 47. K3 ...hxg4  48. hxg4 the Black King cannot make inroads into your territory through the f or h files.  It all becomes about your passed pawn, which is what you want.  Your King can eventually drive the Rook off of c5 and then you fight tooth and nail to bring that pawn to it's queening square.  It'd be a hard fight, but that one pawn advantage should be enough.