Well I stand corrected. To your point, the main problem folks have with supporting this dev is that he's withholding development if his arbitrary funding targets aren't met. Which means individual supporters (unless they're pledging very large sums like you) are not facilitating development unless the total pledge amount (which they have no control over or responsibility for) is sufficient.
He also said he'll adjust the time he spends on the game per month based on how much the pledge amount covers his funding targets. It would seem he has retracted that policy bc he's not working on the game at all if he arbitrarily decides the support level is too low. It makes him look unreliable, especially in light of the tuff talkin pay-to-play shit.
I get that he's pissed off at not getting enough money. Maybe the tuff talk is like his outlet. And it is valid to an extent considering his gfx skills are objectively good and there are porno games with 1000s of supporters which are, imo, utter crap. But that's how this niche, kinda shady online cottage industry for porno vns works. It primarily runs on mindless hype, and one's skill as an artist/renderer counts for substantially less than it should. If he can't accept and adapt to that reality he won't last.
You're a mensch for doing this, really, but I humbly suggest carefully thinking through how far you'll go to support him. Eg figuring out how much money you can afford to pledge to keep him working for, say, a year, if support doesn't increase or even declines.
PS: check out either/both of the 2d games advertised in my sig.