Thank you for your honest, and negative opinion of the game. I know why you're disappointed, you didn't get what you were looking for, your "...reward for your grind work..."
(IE .sex, sex, sex and more sex.)
I'm sorry you didn't read my 1st page intro stating that this is not a 'only for sex' game,
it's an adult adventure game.
The renders are Hi-def (derived from 4k), the plot has twists and surprises with well developed characters that have background stories, not wooden 1 dimensional props, the mini game-puzzles you complain of are easily played & solved (with hints) there are great mini-animations throughout and the game creates a world that is vast and leading up to an even bigger story with a twist at the end.
But all that is lost on you, I see. So Good luck finding your sex only game.
And thank you for making me post this once again, to explain to those who haven't played it yet Callisto-X, is an adult adventure game!.