Yeahhh... the nickname thing will be important later down the line. I'll probably edit the content warnings at the start of the game to really clarify that there's mild psychological elements just in case, too - it wouldn't hurt.
For Iris's event, make sure Saori Event 5 and Ami Event 5 are completed (They should be completed by the point you get to viewing Iris's event anyway) - then, go nowhere (evening),
Hope this helps :)
I'm hoping to add more characters later down the line - but my number one priority is fleshing out the characters already included as much as I can. Don't want to spread the content I produce too thin across too many characters.
As for the music - thanks! Funnily enough the main concepts for the game first came around through creating some of the tracks within the soundtrack. (The title theme, for example, was an old piano recording from 2019 - I believe). Glad to be putting my music into something I'm proud of! :))