In my experience of the game, the description is a lie to the face as it states all maled have been more or less killed off yet all these monsters and other races have male members that are present, this is excluding plant monsters and such.
I wouldn't really say that it's NTR either since you're the "only" male and there isn't really much romance from my perspective, yes you do have sex a handful of times and a hand job or blow job as well. The drop off is that the MC doesn't do it all too much meanwhile most if not all the women you meet will typically be raped and impregnated by monsters more often than not.
The MC is a funky sort as he's just spawned into existence then thrown into the world and left to his own devices, he's then given a clear cut goal of removing "Lust" and as mentioned prior, he doesn't really do anything. As far as I can tell, beyond the first rape, all the rest are forced, you cant do anything about it which is bland and boring as a player. The first rape you can choose to sit back or intervene BUT the dialogue is the same whether you intervene or not plus or minus an extra line from the woman.
It feels like they had an idea going but then decided against it only to get something more lackluster, MC is legit built up to be a giga dick guy as his penis can change forms to match that of a monster as well as sizes yet this is poorly explored.
My advice to the devs would be to open up the options that MC can take with the women hes presented with. Save them, fuck and knock them up or sit back while the clearly other males plant their seed. Another thing would be to change the description to match that of the game, Enick is not the only male left on the world, don't mislead players or even potential players.
Overall however, it was reasonably fun, it's only really worth a single play through imo, there's not much going on gor the MC. The art is really really nice and I'd like to see more of it. Despite the rating for the game as a whole, personally its a humble 7/10 game depending on how you look at it and what gets you off.