Thanks for the write up. About marketing I've had some success with reddit a while ago. I posted on /r/Webgames and got 3000 views but only 1 comment (which wasn't related to the game) and no ratings . Maybe there's a visual novel subreddit that allows self promotion that you could post to.
Also I saw on twitter say that they get more sales on steam than itch and its an order of magnitude more (i think he said 300 times more but that seems like too much). However I don't know if it applies to free games and it's harder to put your game on steam.
Do you have any resources on making art like you do or writing a story? I'm a noob at both and I want to make more story rich games.