So some advice I would like to give too:
Don't be afraid to rewrite some dialogue, or scene it's sometimes neccessary to make the rest of the game mesh well with each other, and/or you don't feel happy about some old dialogue, if you don't like it I trust you to fix it.
Transparency and communication, if you don't get what this advice means you might as well be a rock. I don't even ask for much if you're gonna be gone or delaying something post on Patreon and/or Twitter (because everyone and their moms has one) AT LEAST once a month. Don't go promising the sky and moon to your supporters (this is solid advice for ANY game dev) be transparent and listen.
Sex scenes the reason why most of us play these game (or start playing them, don't lie), don't feel pressure to put it in if you don't feel like it fits, and don't put them just any where make the readers work for it (like real life) make them care for the characters first.
Dialogue is important and getting it perfect is hard and there's only a few VNs that have done an amazing job at it. The dialogue makes the character feel real (I don't wanna mention this game but After class still has the worst dialogue in any VN) and not a 2d sprite.
Sometimes dragging a scene out is bad and it might feel boring, but those scenes can be enjoyable if done right.
All in all it all comes down to writing and character, if you can do that well you're on your way to a great story.
P.S Something I've always wonder about FVN devs is that what inspired them to make their game, like I don't remember who but I remember someone saying they made it cus they played Morenatsu and thought its was emotional and thought they can do it too. So a question if you're reading this Minoh devs what inspired you to make the game.