Very good, very nice, I love it. Though, If I may; When Miles asks where we came from and then asks if we're a salesman, it be funny to have and option that says "No, I'm a magician, I can make a whole horse dissappear. Wanna see?", if you choose to explode the kelpie with magic and are lighthearted and detached.
I don't know I was reading it and thought of it suddenly and thought it was funny.
Apart from the little joke I thought of, the story is lovely, can't wait for more!