Well said.
I do not like most horror games here, because of low effort. Putting in gore and shock elements is just very easy, so indie devs can put that in, with little budget and skill, I believe that is a big part of the reason why there are so many horror games here.
The reason I asked about Steam, is because Steam is the biggest fish for game publishing on PC. If you look at AAA releases, you might see their logo beneath the title alongside Playstation and Xbox. Some other stores do not sell games directly, but sell Steam keys to those games. Maybe in other regions other stores are more popular.
See here (you need to click satellite view for better information) https://store.steampowered.com/stats/content/
Well, and this biggest fish does do publish those indie adult creators of cartoon nsfw stuff.
And Patreon is the most popular crowdfunding subscription service. It fits well with the pay what you want method so favored on itch. You might have seen Youtubers and other influencers promoting their "patreon". They also have nsfw cartoon stuff.
I agree, almost none of the games I see target kids even if their 'kid friendly' though I personally love the horror here. There is no shame in making low budget slasher films, and should be no shame in low budget spooky video games. There's a certain charm to them that's just entirely absent now. There are of course a ton of actually good or unique horror games too. as far as the visual novel thing, that's probably me your talking about lol.
the promotion thing is a shame really. If itch just followed the same path as other self publishing websites, or sites designed for creators then they could just have an nfsw 18+ part of the forum for adult games to be freely advertised and discussed. I feel perhaps some of the reason that there is almost no reviews, or discussions on less popular games is because it's not actively encouraged.