really great story, art, references from inside and outside the game.

you could myabe ballence the caracters' screen time a little more:

Haruka's storynet is a lot wider than Sayori's.

Akiko rarely appears compared to Risa and Atsuko

Risa and Akiko seem to only have one path planed each to access their story. a little more access to these two girls could be cool.

some routs present less intersections compared to the others with the same origin. maybe adding some of them could be cool if you have the time for it.