If I had to pick one word to describe this, it would be bittersweet. Mech 6.0, also known as Star, wants so badly to be loved by Dataran, and that's the sweet part. The bitter part, obviously, is the ending, which is not a happy ending.
It was interesting to see the parallels between the original story and this one. For instance, in the original she becomes a human but the price is losing her voice. In this story, she gets a new body, but the voicebox is broken, rendering her mute.
Another thing I liked is, the writing is lovely, as always.
Tl;dr version- This was a retelling of The Little Mermaid set in the universe of The Lunar Chronicles, and for a short story it was surprisingly good.