Personally, I enjoyed Ghost Song quite a bit. The artstyle was nice, the gameplay was fun in my opinion (although the spongier enemies were annoying), and I enjoyed the different areas. However, the ending felt disappointing, and I feel like more could've been done with the characters - especially since some of the very key lore conversations revolve around you being in the right place at the right time, meaning that exploring a section and being done with it too early could mean you miss out on a character being there later on. The fact that a few characters got "you heard all my dialogue and possibly helped with a sidequest, have a reward" while others were left with nothing also felt a bit odd to me. The voice acting for characters was generally solid, nothing exceptional but not bad at all. My biggest disappointment in the character department revolves around a (spoiler) character who seems like they'd be a major force, but they only have a single conversation with you where they drop plot points.

The bosses and minibosses seem to be one of the more divisive things from what I saw, but personally I enjoyed them. They usually had some good designs, and the bosses had some pretty fun fights most of the time. The game's atmosphere was also great, and areas such as the far left one left me with a heavy sense of dread thanks to one of the enemies found within.

tl;dr good art and atmosphere, fun gameplay, spongy enemies, some disappointments when it came to characters and the storytelling method