Not to be a parrot, but Falcon and LTU hit most of what I wanted to say.
I thought the story jumped around too much. You tried to include too many perspectives, and the work is too short for that. Also, it's suspect that it has taken four years to send people to figure out what's wrong on the station; maybe there's a lot of political tension, but someone put a lot of money into that station and is going to try very hard to salvage what they can.
The Mouse character didn't feel fully realized. When he is trying to decide whether to obey the Sitter or help Erik, I don't really feel his conflict. To me the choice is obvious: no duh, your life sucks and the station is falling apart, so get out. In order to empathize with his choice, I need to know more about him. How deep his loyalty to the Sitter goes, how possessive he is of the station, his delusion about his mother. It's all there, but it's not strong enough to really make us care deeply about him.
The other thing about Mouse is that he doesn't feel like the central character in the story. Erik does. The main issue here is that we spend a lot more time in Erik's shoes than Mouse's.
The ending felt very abrupt. We just passed the climax and started into the resolution when the story just ended. We need some sort of resolution for Erik, and more of an arc for Mouse. The ending also felt wrong. Up in the station, facing down Erik, Mouse made his pivotal decision: fight the groundsiders, support the Sitter, stay with the station. So, when the end comes and he winds up (through no choice of his own) on Earth, why is he so happy about it? If Earth is what he wanted then he clearly could have taken the escape pod at any time; he could have taken his mother, even. He could have chosen to stay with and help Erik. But, no, he chose the station. Shouldn't he be angry? Shouldn't he have regrets? Or did I just get an inaccurate perception of his character?
One thing I'll disagree with LTU on is that I thought the kids' strength was well-explained by the story. These kids are the product of genetic experiments aimed at increasing the viability of children born and raised in zero-gee environments, so it makes sense that they'd be resistant to bone and muscle degradation, and probably be stronger than normal if the researchers overshot the mark.
There is a lot of good in this story, and a lot to like. I liked the concept and the set up, and the exposition and environmental description was very well done. You write good dialog, too. Work out these issues and you'll have a very strong piece.