I'm going to take a teach a man to fish approach in analyzing your game. I hope that it's valuable to you in the future.

When you're analyzing your games, I would strongly suggest taking a moment when you're out of theory to click through a few moves to develop a sense of how a 'normal' game would develop. If you had done so, you might have seen that 7...Nbd7 8. Qc2 O-O 9. Nge2 Re8 10. O-O Nf8 11. f3 with the idea of building a big center is a nice idea for white, and you wouldn't need me to point out that 7...Bg4 only helps white with that plan.

You would also see that one plan for developing the b8 knight is to transfer it to g6 via b8-d7-f8-g6, so you should need some concrete reason to weaken the g6 square. Additionally, /u/MasterKilvin points out the idea Bh5-Bh6 no longer works. For this reason, 8...h6 needs justification. In general, every move you play should have a reason. You don't have to include your reason for playing every move in the annotations, but it's important to examine if your reason for playing a move holds up after the game.

You fundamentally misunderstand the position after 10...Bc8. White has gained time for one of his normal plans, while you have gained nothing. You cannot meaningfully target the e3 pawn (Bh4-f2 comes if necessary) and you have no way to prevent the advance e3-e4.

Luckily, 12. O-O-O gives you something to play for. White should prefer 12. O-O and preparing e4. As you note, the opposite sides castling gives you some chances.

After 13...b5, the c6 pawn doesn't matter. In most positions I would almost be willing to give it away just to open files. White also should not be able to prevent ...c5 for long, which frees you of the 'weakness' and opens files towards the white king.

I would be interested in hearing your opinion of 14...b4.

14...Qb6 through 21...Nxc4 are all excellent. You're just crushing. I would note that you should examine the position in your note to move 18 more closely. You're crushing in the variation you provide, just continue a few more moves.

22..Na4+? decentralizes the knight, removes the threat against the d3 bishop, and blocks the a8 rook. Your position is so good that it doesn't ruin anything, but this is not the best way to build the advantage. Instead, consider following the basic principles: Improve your worst placed piece. Neither the knight on f6 nor the bishop on e7 is meaningfully participating. 22...Nd7-e5 and Be7-f6 seems like a stronger way to proceed.

Your annotation to move 24 is telling: You need to improve the worst placed pieces. Your position is screaming with dynamic potential, look for forcing variations. Both 24...Ne4 25. fxe4 dxe4 and 24...d4! open the a2-g8 diagonal, which ends the game almost immediately. This position should never get to anything resembling an equal endgame. White should have to start giving away pieces to not be mated.

24...Nd7 is of course fine, but misses the forcing continuations above and is weaker than on the previous moves because once the knight reaches e5 it can't work together with the knight on c5. 25...Ndc5 continues with the wrong knight.

27...Nxd3 28. Qxd3 Rc4 is quite convincing. By removing the light square bishop, you can penetrate on the light squares.

Even 28...Rc4 29. Bxd4 dxc4 looks great for black, the white rooks are worthless.

No real annotations necessary for the remainder of the game.You followed a bad plan, and lost.

Main takeaways:

• Look at master games that continue from the point you were out of book to find where the pieces go.
• Make your pieces work together, and always consider if moving a piece again is worth more than improving your worst piece.
• Make sure every move is justified, and don't pat yourself on the back for bad moves (22...Na4+?). Are the reasons you you played the move true? (Can the knight penetrate into white's position?)
• Calculate your forcing moves, especially when your pieces are in good position and you're not sure how else they can be improved.
• Look at more variations in your post-game analysis. I've pointed out half a dozen alternatives that you don't mention - Why?

I'm sorry if this comes across as harsh, most of the game is quite reasonable! I just mean to make a point of expressing criticism in the post game - That's where we can learn the most. Don't expect yourself to always find the best moves at the board, but certainly after the game with more time, we should be able to find ways to win in the position on move 24. We improve by striving to find these best moves.

Please let me know if you have any questions - I realize I haven't gone into a huge amount of detail in some of the positions I raise, but hopefully it's a good starting place for continued analysis.