I hope you won't let these comments discourage you, TessaXYZ. I, for one, genuinely enjoyed the brainteasers so far. They are neither so simple it's pointless, nor so hard it's frustrating. They strike a good balance difficulty-wise, and they are technically well-executed. It's rare to see non-janky mini-games in Ren'Py.
However, I'll admit they break the pacing a bit. I like the idea of having them for daydreaming to "unlock" extra/optional content that has no real impact on the story. For instance, the first puzzle about her daydreaming about the girl doing gym was great in that regard. But having them right during (or between) the two bathroom masturbation sessions was slightly weird: Not only the pacing takes a hit, but it also isn't exactly optional content - it felt like integral part of the story, not just a daydreaming.
That said, I still enjoyed the puzzle, and I hope you will continue making them. It's fresh and distinguish the game from others. Also, models are greats (even though I'm more in the "I like my futas without balls" camp) and story seems interesting enough so far. Keep up the good work, and thanks for the release!