It's clear off the bat that this VN takes inspiration from Planetarian, which I don't really mind seeing as Harmonia is an anniversary title for Key so it makes sense to try to make a homage to an older VN while infusing some new ideas into it. Unfortunately, said new ideas are kind of... weird? While I don't dislike Tipi herself, pretty much everything about her role in the plot results in a lot of awkward moments and forced melodrama that I consider the weakest parts. There's also a couple of twists that would have some impact if they weren't so easy to predict. I really do enjoy the production values of this VN, aesthetically it's very nice outside of a couple of wonky CGs, but what Harmonia does best pales in comparison to Planetarian.