I was at first a little frustrated with the minigames and puzzles, but it ended being very satisfying after figuring them out. I think a little frustration is often required for good payoff.
I think the problem is not that they exist, but the usability side of their implementation. like the computer puzzle, it breaks normal menu/button clicking convention so it's very easy to think it's bugged, which creates the frustration. 9/10 in these games this kinda situation means dev fucked up, so we're all quick to jump to that conclusion.
also because the second step after kicking computer also has further choices, the user won't realize the trick was to kick computer until he's been there several times and realizes there's a pattern with the kicking. at the very least the trick to clear the history should use same 'kick computer' mechanism to not be so confusing.
also, it might not be a bad idea to prompt the player with a message after he tried all direct combinations, to give feedback that assures it's deliberate and not bugged.
the cunnilingus game I'm just not getting. I've tried all combinations with full dom and full lust etc, but no orgasm. if there is a way to make her cum it's a great minipuzzle. but if there isn't, why does it even exist.
so in the end I loved that all these puzzles and secrets to find existed, but the problem is they often make you think the game is bugged. that's a usability or UI feedback problem, the ideas themselves are great.
in an rpg they'd be fine because you could always try them the next day, but in a linear VN like this you're stuck until you get it, so it makes you assume being bugged very quickly.