I'm so sorry to hear that! D:
I did buy Heaven's Grave and played it a little. The apocalypse plot is really interesting. I bought it for romance, but stay for the characters (I won't even mind if there isn't any romance at all). What a nice characterization, especially the gods. We perceive god as perfect, majestic, compassionate, and so on so on. But I was surprised to see that the trio were not like that at all. They complained, they were annoying (yes, they were. I nearly punched my laptop every time they complained), they seemed so humane. And I love that. It has been so long since I last played. I wish I can tell you more, but I forgot. I will continue playing it later.
I really love Rose of Segunda too. But I will save my thought for my review in the game's devlog instead. And I'm waiting for the sequel. The game has booked my money, don't worry >,<
You are a great writer, therefore my follow for you in itch.io. I'm so sorry I can't back you in the Kickstarter/Patreon, but I will try sparing a little money I have to help you a bit. I really don't have any knowledge about marketing, but I agree with the people who think it's important. Maybe try to update progress really often here and in tumblr? Actually I don't know how the marketing for indie visual novel works, because usually I just scroll some games in itch.io and just click whatever caught my eyes (usually it's the art). But I never found you until someone recommend your game in a thread. I don't know how this helps, but just giving you my perspective I guess?
Nevertheless, please don't give up and have a future success! And have a little bit of luck as well! I will still follow your works!