The Woman is a psychological horror story.
We follow the story of an astronaut floating through space. They had an accident in his spaceship, which explains how he ended up there. Since space is a vast, it's a dark place with no ones around, there is only him, floating in the void while trying to stay alive. He does not really have any sense of time, since he has no watch and nothing with him at all.
As time passes, the astronaut begins to have hallucinations. He hallucinates creatures, a different world, but also a person who can change their body and who stays close to him throughout the story.
The astronaut knows very well that none of this is real, but because he has been floating in space for so long without any contact with Earth or with another human being, his brain starts playing tricks on him.
The more time passes, the more the astronaut begins to wonder if maybe he is the hallucination, and everything else is real, along with many other questions like that.
In the end, the only thing the astronaut wants in this hell, in this emptiness, the only person he wants to have near him, is his mother. And the mysterious person who can change their body will try to give him a maternal figure, exactly like the one the astronaut longs for.
The astronaut is meant to represent the audience. In other words, the astronaut could be anyone, which is why we never see his face. And the moral of the story is that we all need our mother to be close to us, even in our most difficult moments.