Goodness gracious, what an outstanding job. This VN packs wallop after wallop, and it just leaves you breathless on the canvas. A truly audacious 15-20 minute trip.
The concept is so ambitious, and needs to be so carefully told in order to feel authentic, and the writing accomplishes this as if it were nothing. It's truly something. We don't see this sort of story told terribly often in Jams, so it's lovely to see it front and center here. The fact it takes place primarily in the Outside World is notable as well; it adds to the feeling of dread of being somewhere where you're not meant to be. Grade A work on being efficient and punchy in such a short period.
The clever use of complete art scenes to "show, not tell" is powerful in this story; seeing the characters emote said more than words could in the most pivotal moments. It certainly helps that the art is gorgeous; the portrait styles in particular were attractive to me. Watching the transformations of the respective characters was a treat as well; it really lent credence to the idea of time passing and going along on this journey with them.
I believe this your first time participating in Touhou Jams, and I am so very impressed with what you've brought to the table. Please, do more of these.