It's not like the FNaF formula is that much popular anymore, also a porn game (or even an ecchi game) should focus on delivering the content rather than be a copypaste of some other game.
It could also be more original without being bloated and they already implemented a few minigames, such as the catboy bashing his ass against the glass and the mouse's stun blowjob, even the pink one pushing her boobs into the camera if observed too long could work to impair the player from checking a code or doing some visual task.
To me it feels the dev already took steps to make his own thing that is FNaF inspired but is also its own project, if we're lucky and his inspiration hits we could see a game that is more than "FNaF but porn".