Ah!!! I hadn't read that this was only a prototype... I doomed myself lol I was so absorbed in the story and atmosphere that I was absolutely jarred when it stopped. This is wonderful, and I eagerly await the finished product.
I love how detailed the characters are, from how they're illustrated and their expressions to each of their distinct and unique personalities. They've each got an enticing depth to them that I'm so, so anxious to further uncover. The writing itself is very clear and wonderfully descriptive, too, eloquent in a way that speaks volumes of the amount of thought put into it. It's astounding how well the story's foundations have been laid in such a brief excerpt.
I also like how the text is formatted, like the way the text stops, how certain words are made bold or spaced far apart... One example that stood out specifically was that thought sequence during the letter-writing scene where the fragments floated throughout the box. It's refreshing and pretty fun, since I haven't seen many VNs that have sought to utilize formatting as freely as this.
Everything, coupled with the atmospheric, intense and fittingly eerie music tells me that once this is fully released I'll probs have trouble putting this down lol. There's probably a bit more I could say, honestly, but whew!!! Anyway! Quality work!! Very promising hehe