What is the best continuation for Black?

Casual Game, https://itsyourturn.com
Analysis of John Coffey vs. KErrNPHX

1 2 3 4 5 6 7 8 h g f e d c b a 0

(black to move) 1. Nf3 Nf6 2. d4 e6 3. c4 Bb4+ 4. Bd2 Qe7 5. g3 Ne4 6. e3 Nxd2 7. Nbxd2 c5 8. Bg2 O-O 9. O-O Nc6 10. d5 exd5 11. cxd5 Ne5 12. Nxe5 Qxe5 13. Nc4 Qf6 14. a3 b5 15. axb4 bxc4 16. bxc5 Bb7 17. Qd4 Qxd4 18. exd4 Rfe8 19. Rfe1 Rxe1+ 20. Rxe1 Kf8 21. Rc1 Re8 22. d6 Rb8 23. Bxb7 Rxb7 24. d5 Rxb2 25. c6 dxc6 26. Rxc4 c5 27. Rxc5 Rb8 28. d7 Ke7 29. Rc8 Rb1+ 30. Kg2 Kxd7

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Pawn promotion:
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