Many thanks for your support and advice.
I agree that making connections with other VN devs would be a help, but I do think I do need to do more work my social media presence, as well. I'm not going to pretend it comes easily to me, but I think there are aspects of every job that you invariable don't enjoy, and with any luck, the parts you like outweigh them.
Before, I had the marketing strategy (if you can even call it that) of 'if you build it, they will come' and it seemed to work fine for TROS and my previous, smaller titles. But the same is not working for Heaven's Grave for whatever reason, and so I need to change things up. Whether getting my studio more visible through social media will help or not I can't say, I doubt it will hurt.
Yes, I did wonder if it was the fact there are no female LIs in Heaven's Grave that was a factor affect it's performance. It's certainly something to consider for future titles.
And you are not the only one who has suggested doing a TTOW kickstarter instead, since it is most likely the more popular of the two games.
I certainly wouldn't be opposed to the idea, but I do want to do right by those who have been patiently waiting for BFF.
At the moment, unless something significant changes in the next week or so, I will likely do a survey (as I did before with TTOW) and find out who would support either kickstarter, one or the other, or neither and then go from there.
Many thanks again for your kind words and I appreciate the time you took to give feedback on the matter. ^_^