Wow! Great atmosphere, great writing, great images, just great! Would have liked a more definitive ending, but as it's left open I'm going to assume that my Grace killed the beast because she is clearly badass.
Only suggestion for improvement is some transitions, having the text suddenly "appear" often meant I had to quickly scan the text for where the next text had begun. If there was a transition, for example the previous text fading to grey, then the new text fading in, I think it would have made it a bit more immersive.