It's clear almost from the very beginning what problem the protagonist is facing, which builds tension, which is resolved at the end. Pacing is good. So the story is well told, and I like that you were able to do it with very few words. It would have worked without the one line of the rapist, although this would also have changed the interpretation somewhat.
A couple of things I felt was off or could have been improved:
1. Having the film in colour and the flashback in greyscale would have made it more clear that it was a flashback, although I thought it was already pretty clear.
2. At 1:21, I would say the rapist's face should flash quicker, so that the viewer doesn't start believing that the rapist came back for real.
3. In the flashback scene, you cut from the rapist pushing the woman to the bed fully clothed, immediately to the leg of the bed moving with sounds that indicate sex. It's clear that you want to communicate that the woman is being raped, but the sound has (at least to me) humoristic undertone. In fact I'm sorry to admit that I involuntarily smiled slightly at that moment, which is obviously not the feeling you want to induce. Perhaps you could have illustrated it in a different way, for example a waist up shot of the woman trying to push the rapist off of her while he keeps thrusting. It's a difficult thing to do tastefully.
I hope this helps!
