I enjoyed this experience! I did not realize it was a demo, since it was such a kinetic story, structured to my eyes something like Planetarian. The characters in this story are endearing and while I think this qualifies as a complete narrative in its own right I'd be happy to see more. Roslyn is a sweet, earnest centerpiece to the VN.
My one quibble is that in its present state it was a very visually static experience—I of course understand how complex art generation is, but I think even without creating/commissioning any custom assets, some more could be done with various effects to introduce more dynamism into the visual frame. But it's not a big deal, and honestly the story would have been intriguing even had you put it completely in NVL mode.