This isn't a question about the game, it's a bug report. I've made a good faith attempt to find a way to communicate with ICSTOR via Patreon or his web page, and since no option for non Patrons seems to exist other than Discord (and I refuse to use Discord), this goes here.
There's something catastrophically wrong with the Milfy City 0.3 PC Version as it operates on my Windows 10 PC.
Specifically, it's behaving as though there is very large memory leak. Basically, playing the game for an extended period of time eventually causes all other functions on the PC to slow down, eventually hanging the game and everything else.
This is a problem if you try and play through the existing content in one sitting.
I have no idea where the memory leak is coming from, but since I don't see this kind of behavior in other Renpy engine games like "Daughter for Desert", the presumption has to be it is either in the coding of the game itself, or in one of the animation engines it makes use of.
(I'm also making the good faith assumption that the program doesn't contain anything else that might compromise a system.)
This is a shame because the game is one of the better made ones I've seen in the seething ocean of trash that comprises Patreon's Adult Game offerings.