Agreed. There wasn't enough character development to get me to care about any of them. The whole setting was nice but a bit too bare-bones. Also something that seriously got to me was the kids themselves. Ok, so it seems that it was really expensive to go out and be a space miner, so you had to have a contract and they basically 'sold' you to someone who would pay for your trip in exchange for a certain term of labor. Fair enough.
Also, space mining was incredibly dangerous and lots of people died in accidents all the time. Again, fair enough.
But then this couple brings three small children along. WTF? And I believe they even specifically said they brought them with them. Who pays for the kids contracts? If they were rich enough to not have to have contracts for 5 people, three of which couldn't work anyway, why the hell would they need to go out to space? And furthermore who would be willing to blast small children into deep space mining operations where even adults had a good chance to die? None of that made any damn sense.
It would have made a lot more sense if, say, the couple were in this accident, she was pregnant, the guy died, and she went and rescued the woman. Or hell, something, anything other than 'We brought some 2 year olds into an extreme mining situation. Thought it'd be a good idea.'
Now, having said that the writing was well done, and the basic plot was nice enough, even if it was a bit overdone.