Overall I liked this story. Maybe I'm just not well-read enough to recognize the similarities between this and other, better told, tales, but I found the characters interesting, especially the Australian Aboriginal astrophysicist, and the dilemma engaging. I do agree with Peter Tupper that, what's the point of leaving when all you have to go back to is post-apocalyptic chaos, but hey, better alive in chaos than dead in tranquility?
I liked the constant references Anna-Jing made to her ghost leg, as I've heard this sort of thing happens with real-life amputees.
I also quite enjoyed the moment when Mick tried to admit to having cancer, to which I thought, Oh, it's going to be one of those stories, only to have that reveal immediately reversed by Gabriel calling him on his lie. That had me on my toes for a few minutes.
My only real wonder was why, in the end, Mick wandered out into the Mars wastes and killed himself. Sure, he's staying behind to die, but does that mean he has die before the crew leaves? Why not see them off with a hug and wave, watch the ship disappear into the black, and then harvest what soy the others left behind and wait it out? Maybe write a memoir or something to transmit back to earth. Again, better unnecessarily alive than unnecessarily dead.
Good story, though.