I agree, that's why I have been on Patreon for over three years and I have 5 projects finished that have a total of over 6000 picture and almost a million words between them. I have definitely built up my reputation. So, I do not think that could be effecting it.
The thing is though, you can't assume your reputation with people looking for one product will translate to another. I've downloaded your other stuff but I couldn't get through it because it was too heavily focused on the writing, and there wasn't enough visual stimulus to go with it. People who are into your writing will probably not be interested in a match-3 game. Most of the match-3 games, if you look at them, tend to be very brightly colored and have a SFW mode so they can be marketed on platforms for casual gamers who want a bit of eye candy with their candy crush, and then have a NSFW patch for the porn crowd. They also tend to be extremely simple with a few hand-drawn poses for each character.
Your characters are much more my speed, and I played through the full demo because they were very well designed and the transformation effect was right up my alley. However, people like me do not tend to want match-3 games, and I suspect your previous followers don't either. Honestly you would have been better off investing in a fetish oriented RPG or VN with about two to five minutes of new erotic content for every 10 to 20 minutes or so of gameplay, in the vein of games like the Opala series, Elana Champion of Lust, or MGQ Paradox. That would translate well for your following that you already have for your writing and attract people who want the immersion fantasy of playing a character. Plus the monster transformation fetish isn't well catered to right now outside of text-based, since most of the transformation games out there with a heavy visual element or combined text and visual elements are forced sissification, which I think has a much smaller market cap than monster transformation. So your main competition would be something like Latex Dungeon.
You also have the female anti-hero element going for you, where you are playing a female who is corrupting other characters, bonus for being a non-succubus monster. So basically I'm saying you have a great premise but you went after the wrong market. Also it's only been a few days short of a month since you posted the demo, and honestly a demo like this doesn't scream "tune in next month for more awesome content," it feels more like a mini-game for your followers, so people who just look at screenshots and download a game aren't going to be looking to your Patreon page for more. If I may ask, where else have you posted the demo, and what kind of responses have you gotten on those forums? Between the amount of time since you've released the demo and your marketing strategy there hasn't been much time for you to have a turn-around for paying players.
So in summary:
-Your genre choice for this game won't carry clout with your existing fan base
-The hardcore MoGi/Transformation crowd doesn't overlap well with the match-3 crowd, open world/sandbox story-driven RPGs or VNs work better
-No draw (self-contained demo, no hint of what's to come)
-Not much turn around time for community response to your marketing strategy
Also as a bit of an aside, even a side scroller with easily modifiable save files and a scene gallery would work better for MoGi transformation in the vein of like MoGi Origins (although they've squandered a lot of their capital with the MoGi community due to delays despite having a kickstarter, donation drive, and a Patreon page), as those who don't want to play the actual game could just get a complete save to view the gallery. So honestly if your goal is a quick return on your investment, then you might have to rethink your whole strategy. Which really sucks considering how much you've already poured into this, but that's just my two cents.
EDIT: Just thought of something right now. You don't have to scrap the premise of the game. What you could do is add story elements before each showdown to add context to why they are duking it out Bejeweled style. So add some quick conflict beforehand, then bam! blow your opponent up by stacking bricks better than they can. Also, I don't remember if you did this or not, but for your next demo be sure to add something at end of each match that's something along the lines of: "Would you like to see more? then please support me on Patreon! Future versions will include FULLY ANIMATED SCENES (Caps, bolded, flashing lights) and story elements!" Obviously with a direct link.