c'est key donc forcément j'ai essayé, c'est vraiment un viiieux vn avec les graphismes qui vont avec mais ça va l'histoire était ok pas plus

Depressingly mid despite having some potential and nice presentation -- story is too short to do much of anything interesting, and what time you do have is mostly spent meddling around.

Such is the fate of the kinetic novel -- too short to accomplish anything interesting and also too restrained by Key's need to maintain its brand image. What you're left with is a predictable story that could've been more, had it been produced by literally anyone else.

The more the story twisted the less it made sense to me. Personally think it would have fared better staying as a post-apocalyptic comfy slice-of-life sort of story.
That being said, it was still a decent read. Harmonia focuses mostly on emotions and the understanding of them.