I didn't feel the ntr, except where he saw Kana getting screwed for the first time and most of it was like, 'she has a penis' rather than getting hurt by ot as he even has the option to make a deal to watch and get's turned on by that, like she is his childhood friend and all, he had a crush on Alice but Alice doesn't have a scene I think.
The MC looks like he is just a pervert that goes with the flow of things, the game is awesome and there is a bit of Netorase, wouldn't call it Netorare, but he isn't in an actual relationship with any of the girls and Jack also ask Sayako to go to the girls so he can watch.
MC also looks a bit girly, like he should be dominated by a hung Futa, kinda surprised you aren't adding scenes for Sayako on Jack, and make the party Sayako's harem, like the real MC is Sayako.
There aren't that many NTR Futa on Male games so I don't know where you got that statistic. Specially where the MC is cute and have an actual face, like most NTR games don't even bother to finish the MC they only focus the girls.
Also playing using Joiplay, had to dissable the effect on the options or play at like 10FPS, there are some minor visual glitches, mainly the pointer on the menus and whatever the enemies drops, I just see a black square. Battles are very good, menus are super polished, enemies level scale with the party level. A lot of content for a first release.
Just wished that Sayako would tap Jack's ass having his seed splattered on the grass while a galon goes on his gut xD