TIL RNGeusEx had a Twitter.
I had a look, and I think you're mixing a few different things together here.
If the issue is the developer reposting NTR commissions, I can understand why that would put people off. From what I saw though, it was two commissions by the same supporter, not something they regularly post. That same supporter has also commissioned around ten other commissions that aren't NTR.
As for the game itself, what content are you referring to? If you're talking about the Sayuri/Asami bad ending, then I'd agree that scene falls under cheating. But when people call something an "NTR game", most people are going to assume the protagonist is regularly getting cucked or that stealing the girls is a core part of the game. That's simply not true of the current version of the game.
I think it's completely fair to criticize the direction the game's heading or to be worried about future content, but it's important to separate that from what's actually in the game today.
That being said, if you have any ideas that aren't just "Add NTR" or "Don't add NTR", you're more than welcome to share them here: /t/6593314/what-do-you-think-the-game-needs-most. I'd love to see more discussion about what people actually want added to the game for a change. 😅