Nearly every aspect was top-notch, though I'd specifically mention the following:
1. Story, writing, and characters are actually interesting and entertaining. What little characterization that can be present in a demo is here and compelling, and the dialogue does not stagnate. Personally I found the narration/internal-dialogue charming, though the MC being a goober could perhaps be annoying to some.
1.5. The setting and premise specifically are quite unique, and could develop to be more-so.
2. The experience flows well; transitions are well-constructed and placed, and I experienced no issues whatsoever during my playing of the demo.
3. Obviously it is currently a demo, but the scene that is present is extremely promising from both a technical and creative perspective. The camera work and focus of shots is especially well-done compared to many other VNs, and animation was stellar.