Milfy City was my first adult VN game I played, so I have affinity to it.

I like the artwork and some of the characters. I do not know Icstor's personal situation, so I am not going to assume anything. I have an OK and probably outdated computer and I can see how long a SINGLE render takes for me. Maybe it is time, maybe it is hardware issues, maybe he has burned out, maybe the writes burned out. Maybe he is in a funk. Creators can get that way.
IMHO Patreon subscribers should view their donations as (ongoing) support of the artist and as not paying for a product. You can always stop support, either temporarily or permanently.