Luyuu, thanks for the excellent feedback!
We took great care to make sure we fostered a lived-in environment and kept music as true to the character as possible. I'm glad you enjoyed it!
As for the rest of it: Kokoro does indeed have the power of manipulating emotions, so we used that a bit to our advantage in writing each route. For instance, Aya's chapter is meant to be an interview and turns into what it does because of Kokoro's presence. Similar idea for Wriggle's chapter, as each character gets more and more open towards the end.
To avoid spoilers in answering some of your observations, I would happily ask you to DM me on Discord through the Jam server and I can answer at best convenience!
Thank you so much for playing, and I hope you consider playing again when we release the post-Jam update, which should hopefully address some of the issues mentioned!