Wow. This is a really good example of how a compelling story doesn't need to be complex, wordy, or anything. This story is compelling and the writing simply communicates it.
And with the minimal visuals and audio, it strikes the ideal balance between showing and telling, such that the reader's (player's?) imagination effortlessly does all the heavy lifting.
Congratulations to KatBFine for this success and thanks you for sharing it. There's a very personal vibe to this VN, and I'd guess it took no small amount of courage to not only make, but then openly put this out.
Thanks again and I look forward to the extended edition!