As much as I enjoyed the game, my main complaint is how one of the routes is the MC basically dating her brother. While yes, it's not really dating someone related to her by blood, it does make me uncomfortable because adopted/step-families are still families. Making Rod a dateable option, for me personally, made me unhappy for families that do adopt or are step-families and families that are not necessarily related entirely by blood. I still love the plot/curse of Rod's route, and it was fun, but it did make me uncomfortable to a point (though they at least somewhat acknowledged it).
Waltz was nice, but in comparison to the other routes I found him rather boring. In all the other routes, both the MC and her love interest develops as a character/person that ends up working together... but in Waltz's route, he just 'taught the MC to be good/kind' and he stayed exactly the same.
That's not to say that I disliked the game; the art is gorgeous, the UI was beautiful, and I really liked the writing and all the characters; the two complaints are above are the only complaints I really had about the whole game.