To start, i'd like to make some points of my original comment clearer. On the first point, i was already aware that some songs are from the public domain but i thought that some of those songs were Echo Project's and other creators original ost, that's why i mentioned the possibility of them getting mad about but, if the music used are from public domain then my mistake. On the second point, as someone who has read many VN's over the past decade i simply was trying to help by providing my point of view and a few ideas for improvement, there is no need to be a ''professional writer'' to write a conversation between two people. Other conversations that happen in the story flow more naturally and only the hospital one is ruff around the edges. Point 3 is mostly about world building, in other words, providing what can be considered the common sense of the world, in order for the reader to situate themselves with the new world they are exploring, something like a flavour text.
In the end my comment is just that, a comment and choosing to take the criticism and advice at face value or with a grain of salt is yours to make. I love reading VNs and have already read a lot of them, including many that ultimately died without an end because the creator lost their way and/or gave up half way. My hope was to help a new creator not only improve their story but also grow as a writer, by pointing out what i considered shortcoming in the writing or plot, but like i said before, it's just a comment. For the most part i enjoyed the VN and would like to see what will happen next in your story so goodluck