What a wonderfully-crafted visual novel this is. Everything regarding the story, the characters and the progression of what the reader knows about what's going on was done so well. I was led along and I learned what I needed to at just the right moment before figuring it out for myself, and overall I think the narrative and the 'twist' are very well constructed for a game of this length. Especially the 'other' Phebe and her own resolution.
I liked both Phebe and Peyton, though I could feel there was an almost tragic element to the story from the beginning, so I kinda braced myself for tragedy early on. You do that very well. At the end I was sad, but I was also happy that the sadness was genuine because the story was so well written.
Overall I really, really liked this VN, and I think you have a real gift. I'll happily read whatever else you upload in the future.