An amateurish game

Note: This game is bad from beginning to end. Please abstain from commenting about how bad it is. Also, I only posted this game because I won despite making majority of the mistakes. Can anybody explain it?

Qg3?

Hm.. But 31.Qg3 f4 leads to 32.Qh4 e2. Isn't that a bad position for white?

In my opinion your opponent made a huge mistake with 30.Rxb6, 
much better would be 30.Bc4, which as I see it forces you to take it,
which would lead to better possition for white. So 29.Bd5 might not be your best move. Just my two cents :) 

indeed. Bd6? Bb4?!(white's about to castle no point in pinning and also wasting a move) Bxd2?!(inaccuracy) Ne7?!(dubious move) e4?? not bad in the endgame though:)

legend:

?=inaccuracy

??=blunder

!?=interesting move

?!=dubious move

!=good move

!!=excellent move

wu345- Yea, lots of blunders in the opening. I just wasn't sure whether those were inaccuracies or blunders, that's why I didn't denote them. You can easily figure out the bad moves though.

Bandito-30. Bc4 Bxc4 31.Rxc4 Qb1+ 32.Nf1 f4. Doesn't that leave black with a pretty huge positional advantage?

I loaded your game in Chessbase, and analysed this variation with Fritz 11,
the engine equates this possiton as white having an advantage of around 3 pawns (or a knight), so that makes me pretty sure white is better. 

I dunno.. I still haven't found good moves for white in that situaion. Maybe I just missed it.

Why can't 32... h5 be played? 

White didn't play like a 1650 in any part of the game.