Im Sorry, but if an Element of you your game is not Adding to the Gameplay of the Game, IT IS BY Definition FLUFF. And when it comes to Puzzles with No clear instruction as to what you are supposed to do?
Concrete FLUFF!
The Renders could be 10/10, story could be 10/10, but If it is Behind Frustrating Puzzles, It might as well be 0/10, coz your players are actually gonna go, "Oh, How was I supposed to figure that out?" or "Why can't I skip this from the Beginning if I can After Failing Multiple times?".
Very clever puzzles. Too clever for an AVN.
Know your Audience.
That's All I'ed say on the matter.