I don't know maybe I'm malicious, but this seems more like a scam at this point.
Project after project after project, it's the same story and not only with h-game "community".
If it's not done - completely - don't pay for it.
Long long ago "demo" was a cut part of the whole game so you can taste the experience and decide. It's not incomplete showcase of cool ideas for future implementation filled with placeholders: it's alfa version or even proof of concept.
If it's "chapter X of Y" - don't. At least wait for whole thing to be published (it probably won't be and you know it).
"Early access" means paid beta testing (paid by you).
Patreon/kickstarter is the same but paid monthly.
If it's not done don't pay for it. Ever. No excuses.
Just look how much of it pops out on "latest" page of f95zone. Then look how much of it stops after 1-2 updates.
When someone
REALLY wants to make a game he won't be begging for donations and sharing pieces scraped from his HDD. He would make it no matter what and show it only when he's finally content with it. Paying scammers you encourage and reinforce this kind of leeching behavior.
When considering paying for complete game, one last piece of advice - never pay more than 20 bucks for it.