Man dats crazy i dont even remember wut I made. and ye its pretty mid, I just ran out of ideas in the end. Its funny coz i have actually never heard the term macabre eroticism before. thanks for mentioning it.
Hey no worries, ero-guro does have that sort of appeal. You did a lot of things right on the creative side of the game but the main issue of the game is honestly just the controls and the lack of an easy gallery. The atmosphere and animations were pretty good, and you didn't do the annoying thing where its too hard to lose.
If you want to reach a more mainstream audience look into softer forms of guro/dismemberment, like transformation, magic, petrification, brain fuck, and so on. You could also have it it happen to other characters in a less explicit way/offscreened.
I'd also say that having a few endings where she doesn't die (mindbreak/capture/rape) would be good to make the deaths feel a bit more impactful/suspenseful, or some voyeur type stuff where she's watching another girl while "waiting her turn".
I think the main thing to learn is to simply cut content that you're feeling lazy about. Game would do a lot better if the game was half the length, with the filler cut out, and a working gallery.
I gotta ask though are you using a qwerty keyboard or what