Yeah honestly I suspect what's going on here is you thought you would drop a demo and instantly get hundreds of Patreon subs, that's just not how it works.
I disagree almost completely about the demo, I thought it was great. It was fucking hilarious. You just needed to keep going. If you look at some of the very successful adult games on Patreon, they were far from perfect when they started to pick up critical mass and make $$$. Corrupted Kingdoms was in very rough shape yet that got many subs, the difference is they had hours of gameplay not 10 minutes. You've spent countless hours on Patreon posts for a whopping... ~20 subscribers.
People care much more about seeing that you will regularly push out decent content, than about polish and perfection, at this stage.
You need *hours* of gameplay for people to get hooked. No one is going to invest in you before you invest in yourself at least enough to get to 3-5 hours of gameplay. There are way too many devs out there who just burn out or view this as too much of a 3rd priority side hobby and their games rarely go beyond an hour or two of content. A lot of people have been burned by devs that will not put out content quickly enough (and you are kind of showing high risk of falling in that category right now fyi) - try dropping a decent update every few months for a year and see what happens.