Again, thank you so much for your support! I find your advice really insightful, and it helped me look at the game from a different perspective I hadn't considered when I started working on this!
I'm not sure I can call it a proper "demo", as this isn't related to the characters "canon" story but rather a "one-shot" kind of thing! As I made it mostly for my community, which is very familiar with all the characters and the canon story, it didn't even cross my mind that, to any passerby, the background and intentions of these characters could come off as lacking and not properly fleshed out! I'll keep that in mind when coming up with future games!
Admittedly, there is a problem when it comes to the endings because at the time, and as I'm writing this response, I'm still learning how to properly code different endings, taking into consideration all of the possible choices a player can make through the story. I ended up not adding a fleshed-out outcome for the "Manipulate subtly" and the "Confront her directly" choices since the endings they supposedly lead to could be the same/or not, and if I wrote it one way, it could clash with another, if that makes sense?
Right now, I plan to study how to code endings properly, as I believe it's one of the most important things, mechanic-wise, to make a visual novel really interesting! As of now, I've released an update on the game's overall UI and fixed a few grammar mistakes and bugs.
I'll keep on playing many different VN's and study their overall game design and story flow. Again, thank you so much for your comment. I'll definitely take into account everything you mentioned going into future projects!