This game was hard for me to understand. I played through it three times. I'm going to summarize it here as best I can.
It seems to me to be a science-fiction story where you live on a moon with your girlfriend, Eris. It also seems that (Spoiler - click to show)Eris was part of a Wandering Fleet where she murdered many people as a soldier. At some point she fell from the sky and was left brutally wounded. She is now older with grey hair. At some point (possibly when she landed) her heart was exposed and her aorta severed, and you were left coated in her blood. You watched the wound heal to a small scar. Eris is wiry and has trouble with cold and gravity. At some point you were also violent and followed her like a lap dog and killed people and supported her killing people (this is the part that didn't make sense so is likely wrong). Now you crave more close physical affection but you both hate and love her and she's kind of standoffish so everything kind of sucks but you kind of like it.
It's relatively brief, with complex writing and choices that lead to substantially different material on different playthroughs.