Looks like dev got what he/she wanted with this update, more controversy, more popularity. I believe he/she released this update intentionally to stir up things. Because not a newbie dev and if I'm not mistaken had similar controversy with the previous game.
About NTR, dev should make it
optional, but as I said it was intentional I think. Any fetish content should be optional in games which trying to cater for a broad variety of fetishes. Unless a dev is focusing on a fetish specifically, "optional" is the keyword for any content type in adult games, so be smarter devs or be a lesser evil.
I don't mind NTR or care about it and not specifically look for it in games/VNs (In real life I hate it tho), but it can also be fun in some games for a nemesis story. Because I think I'm not immersed that much with any adult game or any adult content.