Very interesting story, and the music is amazing, very well done! The subtle sound effects were perfect to enhance the mood, too.
For accessibility, the main thing missing is an option to adjust the speech rate. I'm not sure if that is possible in Ren'Py, but if so it would be appreciated. I am sighted, but I know many blind players are used to very fast TTS, and it can be frustrating to wait for slower TTS to finish. Even if you get a voice actor for the full release, a playback speed option would be good, for example I often listen to audiobooks at 1.25x speed.
I've followed you on itch and I'm looking forward to finding out what happens next in the story. Nice job!