Some NPCs actually react to the progress in the main storyline, although I must admit there aren't many of them so far. I'll try to add more from time to time if I can. It won't be a priority though, because, as you've said, I've got quite a lot of other things to take care of between updates^^
Thank you for your nice comment! 感谢你啊 : )
I was actually in the process of doing so at the end of 2022 and uploading HC3 there, but uploading adult stuff on Steam is a hassle with all the verifications, and they're so afraid of anything that could be considered underage, the mere fact of having the main character start as a kid in the game, even though he doesn't interact with anything sexual at all, might be enough to get me banned.
What's more, my game seems to be pretty unpopular as a "sold product" as opposed to a crowdfunding platform like Patreon. I'm also selling it on itch.io right now, but the sales so far since last October have been so underwhelming, even if taking Steam's superior popularity into account, I don't think HC3 would be all that popular outside of a very small niche, so it's been on the backburner for while.
HC1&2 I can't sell them on Steam, since they wouldn't allow me to sell stuff that is officially available for free somewhere else. Since they're both free to download on my Patreon and I don't plan to change that, I'll have to give up on ever selling them on Steam.