there are two possibilities and all are bad/sad:
-this dev thinks that people play their game because they like the shooting gameplay...
-the dev is scamming people by doing minor updates to the shooting gameplay...
all you need is like 6 missions with different enemies and increasing sex animations/traps/encounters
and some customization options for the character.
that's it.
the ONLY appeal this game has is the sex. the gameplay is not gonna be better than resident 4 no matter how much you want it to. if you wanted to make an honest game,but thought it wouldn't sell without sex,might as well just remove the sex altogether.
imagine when your game updates are so lackluster that even pirates, getting them for free, are not playing it.
imagine being the patreon or supporter of such a sham.