How was this a draw ?

1. e3 e5 2. c3 d5 3. Qh5 Qf6 4. Bb5+ Nc6 5. Qf3 a6 6. Ba4 Qxf3 7. gxf3 Bf5 8. Ne2 O-O-O 9. O-O Bxb1 10. Rxb1 Nf6 11. d4 exd4 12. cxd4 Bd6 13. e4 dxe4 14. fxe4 Nxe4 15. Bf4 Nd2 16. Bxd2 Rhe8 17. Rfe1 Re7 18. d5 Ne5 19. b4 h5 20. b5 axb5 21. Bxb5 Rde8 22. Bxe8 Rxe8 23. a4 Nf3+ 24. Kf1 Nxe1 25. Kxe1 g5 26. Bb4 Bxb4+ 27. Rxb4 g4 28. Rf4 c6 29. d6 c5 30. Rxf7 c4 31. d7+ Kd8 32. dxe8=Q+ Kxe8 33. Rxb7 h4 34. a5 g3 35. hxg3 hxg3 36. fxg3 Kd8 37. Rb8+ Kc7 38. Rb6 Kc8 39. a6 Kc7 40. Rb7+ Kc8 41. Rb4 c3 42. Nxc3 Kc7 43. a7 Kc8 44. a8=Q+ Kd7 45. Rd4+ Ke6 46. Qe8+ Kf5 47. Ne4 Kg4 48. Qg8+ Kf3 49. Nd2+ Ke3 50. Qg5+ Kxd4 51. Qg4+ Kd5 52. Qe4+ Kc5 53. g4 Kd6 54. g5 Kc5 55. g6 Kd6 56. g7 Kc5 {1/2-1/2}

I’m black and too move next. The opponents timer ran out and it was a draw how ? I still had available moves as black wtf ?