Hi Komehara!
Thank you for taking the time to write out your thoughts on our game! I'll be frank that due to constraints, the current version really is closer to a concept over a fully finished story. We're definitely interested in wrapping it up sometime though, so I hope you can look forward to that. Some of the planned beats or revisions might address some of the story issues you've listed.
When reading over the script, I joked with the writer that they should do more slice-of-life stuff in the future. I can't actually make any guarantees on that, though ;)
We agree with your statement on fleshing out the main character more - personally I'd like to see more introspective passages to figure out who they are, but I'll leave it to the author to make the call on how the character is presented.
Your list of typos and bugs are helpful and appreciated! We weren't able to get a full testing pass in before shipping it - I barely had enough time to jump around to several of the chapters starts with debug. I'll look into the UI issues for future passes- some were by design since (to my limited knowledge, at least) fading in a sprite hides the narration box, but I felt that there wasn't enough of a passage to clear the text. I do understand that this may impact the reader experience though. I'm not as familiar with Ren'Py interfacing with itch.io to know if publishing a new version would kick a reader back to start, so I might hold off on pushing out updates until we have a good number of changes to commit.