26. Qxd5 might be best.  You still have the threat of Qe5+.  Black can't move his rook because of checks on g8.  You can threaten to play Rb7, and h4 to harrass the knight.  Black's pieces are all pretty useless.

30. Qd8+ Kg4  31. Qa5

I believe this stops the perpetual and you're up a knight.

21. Nc7 seems better than Na3.

26. Qxd5 and Qe5+ both look much stronger than the move played, and after 27.. Kh6, black looks safe.

@zirtoc: Not quite.  31... Qg3+ wins the b8 rook.  I only see 30. Nc2 preventing perpetual check, and after 30.. Ra7 31. Ra8 Rxa8 32. Qxa8 Qxc2, the game looks even.

after 11. ..., f5 12. Nxd5!, ...

Nothing wrong with 21. Na3 but after 25. ..., Kg7 26. Qxd5, ... allows your N to advance via c4

30. Qd8 was the only significant improvement I see.

Thanks for all the comments guys, I appreciate it!

@drunkennite Yeah wow, totally missed a queen there eh?

I guess I should say, Qd8, and if he pins his rook with Rf6 you have Nc2 to defend the e1 square and you will pick up that rook and win the game.

 All in all a nice game

Yeah, I didn't see the knight move. like I said, had less than a minute. Thanks phelon.

Have you considered that 1. e4 might have made the difference?

 Haha. Very clever of you.

Once black gives you the awesome e5 outpost (after 11...f5), you should try to trade off the defenders of that square like the knight on c6 and the dark-squared bishop before occupying it with your knight.  It's a good middlegame plan and worth the trouble since an unassailable knight on e5 would be a crushing positional advantage.

12.Nxd5 was a nice tactic as drunkennite pointed out.  I totally missed that.

21.Na3 was a good catch.

Thanks Bobby.

26 Qe5+ Rf6 27 Rb6 (ouch)

28.Qxd5 Qe1 29.Nc4 Qxf2 30.Ne5 and you have a win, with black not being able to do much about it. For example, 30...Kh6 31.Rxe6 Rxe6 32.Nxe6+ Kh5 33.Qf3+, you win with the passer on the kingside.

28. Qxd5 is not possible.  I believe the game is drawn by move 28.

 If 28.Qxd5 is not possible, then could you please kindly submit a refutation for my line in #16...Because I couldn't see any at all. Oh and if you mistaken the 28.Qxd5 as from the text, then there's a big mix-up - I mean the 28.Qxd5 from the alternative, deviation starting from 26.Qe5+

Just in case visualisation is made easier, here's the line, focussed from start of alternative line: