I must say that the storyline of this game is almost a masterpiece. However, if I had to offer one criticism (not including the intense emotions the game invokes, such as pain, suffering, sorrow, powerlessness, despair etc., and whatever you do or choose, you feel like bad guy, as it seems to be one of the main intentions of the game) it would pertain to the endings. I am not sure. They felt too rushed, or too short? To illustrate my point, I will provide an example below, so be warned, SPOILERS ahead:
The first ending I got was 5. After the release of the virus, the game was a bit too quick to skip "a few centuries later". I'm not saying it shouldn't, as it's very nice to see the long-term results of our decisions, but it would be better to give us more information about the immediate consequences and events as well. For instance, what was the initial reaction to the virus from both the aliens and humans? How did things develop after that? What about Leon? What happened to him, did he come to terms with your decision and decide to help you out? How was the human colony destroyed in the process (I know it was due to lack of power and starvation, but you could have gone a bit more into detail)? The MC should feel the pressure of his decisions and the weight on his conscience about how he let all those colonists, including the sweet girl and her mother, slowly starve to death. I mean, the game didn't hold back on inflicting pain, suffering, and sorrow until the endings, but at the moment the player should have been hit hardest, those parts were completely skipped (though this doesn't mean you should only explain these negative parts, but positive things seems to be somewhat covered in "a few centuries later" parts), and endings felt weak compared to the rest of the game, as a result. However, these weren't much of a problem with endings like 11 and 12, where you "die", thus you cannot learn about these things.