Music absolutely bangs. Cannot say it enough. Had two original songs with vocals in my spotify repeat through the end of the year.
Characters are neat. I love companions having their own storylines, I didn't love progressing a single companion, getting loads of battle benefits then going back to square one to advance someone else. It really limited how much I was able to fuse or leverage high level mechanics. It's difficult to onboard party member options in RPGs like this. The ranger captains all rock, world aesthetic is wonderful. Loads of weird little guys that I really enjoyed seeing, collecting, battling with and as. Fusions rock, fusing everything rocks.
The type chart is informed and inventive, mechanics of buffs and debuffs rather than super or ineffective is great.
Progression stutters and feels very limited at times. I just had a lot of issues playing through the game at times. I love the attempt and want more things like Cassette Beasts (but it speaks for itself that I wasn't compelled to touch any DLC content after rolling credits)