I'd like a platformer with a female player and a variety of kinks for different monsters. Gangbangs with small horde-like enemies like goblins that stuff all your holes and move on to your tits, hands, and feet. Creatures that vore your character if you run out of health during a grapple. And a bunch of enemies able to impregnate your character, and you give birth a minute or so later to a full-grown enemy that can rape and breed its mother again.
And it'd have pixelated 2D graphics, because they have a certain charm to them. Every game-over would have a unique CG; goblins gangraping your character, giant slugs covering them in slime while fucking them from behind, wolves forcing them to the ground to take them doggy style.
Also it'd have a gallery where you can go through all the enemies' animations and CGs, and you can choose to go back to replay stages/levels rather than having to go through a new game every time.