I agree, We as a player honestly wouldn't expect such things from fap materials like eroge, but I honestly applaud the creators for trying. And because it was different from a vanilla eroge, It had succeeded to capture even veterans who got tired of same old same old kinda predictive gameplay. I admit it's not for those who are able to enjoy the usual junk of eroge lying out there, but it's kind of a rare find for some of us.
I say it's in my top 5 picks,
Some other notable games i liked were, Mansha ritsu 300% 2(aka: Train Capacity 300% 2) which had poor game mechanics and lot's of flaws but was a rare game you wont find another alike. I am also fond of Goblin's burrow Ill borne which had some good impregnation mechanics, (I am fan of Fire Emblem Awakening which is a non eroge but with vaguely similar mechanics), tried a lota things but nothing similar found. Again it's missing lot a things i wish it had but still in my top 3. I also Like Rance IX Helmanian revolution which is almost as good as any RPG (non eroge) with missing basic features like voice over, but still in my best 3 picks for the plot and commitment. And something that i recently found was this game called NEET ANGEL and Perverted Family which is not that good but made me play for long time without irritating(perhaps the only dating sim setting game ever to keep me engaged for so long).
So why am i sharing my picks, honestly, just on a whim. But also I want to just say i liked these games not because they proved to be good fap material... no..... I liked the idea of the makers to go beyond the unexplored areas so boldly. I mean if every eroge maker just tries to make a high quality animation with same 20 year old mechanisms with some improvements in controls and character designs sooner or later the eroge space will be filled with ripoff like games with not much differece from one thing to other. that makes games no different from hentai, which is currently shit im my opinion as of now