I had the feeling that Demitre wasn't going to be a one and done kind of fight, and Karen did talk about roles and stuff near the end of 1.2. So it only makes sense that you're planning a Ch2 for the game, and it really helps on every front including file size. About Last Human, I planned on reading more about it after I was finished with game, so I'm gonna take a look at the posts but I'm already hyped after seeing all your work and progress in Serenity.
Abour Lucy, I 100% understand your position, man. Neither I am a big fan of incest, it's not even a matter of liking it or not for me, it's more about not minding it. I don't mind incest irl and that standing kind of transfered to AVNs. I just like the deeper intimacy between the characters, feels stronger than the standard dating sims. out there, not that they're bad either.
And I knew that the game wasn't standard HS, I kept asking myself which software it was. I didn't play Melody but did play Sylphine quite some time ago (0.2 I believe, way back then), so I was like "Why is Celeste looking so different?" and it must take quite a lot of work to make these "special guest" things. And it makes sense that there weren't many during the whole game as of now, only 2 (or 3 if Cinnamon is from an actual existing game). But all in all the game is still one of my favorites, man. Really hyped to see what's next, the universe you created here is something completely new and fun to see.