I think I understood, after trying this game out, why "NTR" games don't work for me.
This is a porn game, distributed on a porn-dedicated website. So, the chief concern here is the porn. Right?
I think, from a pure design point of view, this should probably mean that winning and progressing in the game leads to porn. At least.
Better yet, the gameplay itself should be centered around porn.
Here, you play as an adventurer whose objective is to crawl through a dungeon. Alright, there's an obvious problem : the gameplay will definitely not be about porn. It's going to be about managing your inventory and fighting monsters. If I wanted to do that, no offense, but I'd go play, oh, I don't know, Elden Ring perhaps. But maybe clearing the dungeon will lead to porn?
Well, no, because the kink here is NTR. So, far from clearing the dungeon, keeping yourself well-lit, well-stocked and well-armed, you are indeed... Supposed to lose. On purpose. So that the "Corruptor" can play with your "Love Interest". Am I the only one who find it completely counter-intuitive?
Either you triumph from the gameplay loop but you're locked out of the porn - which is, let me remind the postulate, the chief concern of a
PORN GAME - or you lose the gameplay loop (or at least sabotage it), and you get some porn.
So, first argument, let me play as the "Corruptor" instead. The gameplay loop would hence become centred on subtly sabotaging the adventurer so that you can molest the girl. Much more satisfying, from a gamedesign point of view. You could increase the difficulty by upping the suspicion of the adventurer, who'd keep a closer eye on you, meaning you'd have to get clever as the game goes on.
"Hero Party Must Fall (kinda, as its more Vn than an actual game) does that already. We're not here for a copy of it nor another trainer game, enough of those, we want to be cuckolded."
So, second argument, keep the player as the adventurer, but shift the gameplay loop, so that winning it leads to the porn. Off, the top of my head, give the opportunity for the adventurer to get "Nightvision" for exemple. That would lead to torchlight being needed less and would trigger the molesting more often. Or, I don't know, introduce potions of stealth, which would give the molestor the impression that the adventurer can't hear whatever he is doing to the love interest. It reintroduces agency for the player and make the dungeon crawl worth winning... Because the rewards are then spent to acquire way to make the NTR happens in a more controlled manner.
Because, as it is now, why would I play?