I know that is useless but I will continue: since the first chapter we know that this game will have futas, let's stop shaming/bullying the dev and let them make the game they want to make, it's not that hard.
The game only implied that the mom would get the girl pregnant somehow (there are several ways to do that these days, you don't need a magic futa cock), it was far from a clear confirmation of a OBLIGATORY futa direction. Even the developer acknowledges their misstep in communicating this aspect, so it's unfair to argue that the game's direction was ever explicitly stated when it wasn't.
Let's be real, if this was an optional path like in many lesbian games with multiple hetero, furry or futa routes, no one would be this pissed. The developer gets to explore his creative vision and futa fetish, and players get the choice to indulge or skip. Simple as that. But making the futa scenes mandatory in a game that started as a pure lesbian fantasy is like ordering a vegetarian meal and finding a steak in it—you're obviously gonna get complaints and disappointed customers.
I want to stress that I bear no ill will towards the dev. I respect his creative freedom to take the game in any direction he chooses. I sincerely hopes his futa gamble paids out and he enjoys massive success. But when you cater to one niche audience and then abruptly shift gears to cater to another, you're bound to leave a bad taste in some mouths.
Let this be a lesson for future game creators—be transparent about your game's direction from the get-go. If you plan to include content that might alienate some players, make sure they know what they're signing up for. Make it VERY clear on the beginning that the game will have
obligatory non-skippable content of other new fetish that directly clashes with the previous fetish your story is based on, and all this drama will be avoided for sure.