OK, I've read your long note and so I decided to put a review of my own, hoping to help you.
First, I'll talk about the choice of engine, rpgmaker is not bad but I'd say, using ren'py, especially for this game, would be better: easy saving/loading/skiping anytime, possible to put scene in pictures or short animation, better visual and nice backgrounds giving more contexte, no unskippable boring walking when you can't interract nor save, etc...
Second, the story is pretty nice but the way you bring it without much visual and with a loooong text at the start is pretty turn off and annoying, I'd prefer if you bring it along a bit slower, maybe by letting the playing move around and interact during the prologue, for example.
Same for the explanation of how the mechanics work, it'd be better with a gradual explanation while letting the player try by himself cause reading it is really long and annoying (players usually prefer to try it out till they succeed or lookfor explanation themselves after a few fails).
Next is about the scenes development: I think they are pretty gradual which is good starting with blowjob/footjob/handjob and getting to sex later on which make the player increase his horniness and actually look foward more "grinding" to get there and be gratified when it happens.
About the scenes themselves: they aren't bad but aren't really good either, they could be a bit longer (not necessarily with more pictures/animations but) with a bit more text with the girls moaning and saying short exciting sentences (maybe even in a loop till the player chooses to stop it), and also with some choices for the player to do it again or choose the point of view or the position.
Also, better quality and more animations would always be a nice thing.
Overall, the story look appealing to me and the scenes are pretty nice and gradual which I liked but the way I got there with lots of explanation (that I mostly didn't read and skiped) and the grinding which was pretty annoying and not really interesting makes the game subpar at most.
Finaly, concerning the support, I think what people want is more something that looks interesting and promising which they can interact with and see the evolution, while having some mild choice about where the game is going and which girl they want a scene on, etc.
For this, you could consider using polls and make special scenes for high-contribution patreon, but this would only work for bigger project instead or short 1-month games you make at the moment.
I hope this review can help you and I might consider supporting you in the future if I see something interesting