I really liked how you incorporate the music elements, pun names and even its overall themes into the game and cover the "beyond expectations" theme in such a creative manner. Helps provide a cohesive sort of whole throughout the experience. The monster designs are adorable. I liked the octopus drum one.
That being said, there's not much variety of element changes once you figure out the mechanics. And I basically grinded with 1 monster and it sweeps the rest of the game for me. Of course, playstyles vary from person to person. I'm a bit of a grinder.
Post Update: I tried it again, there is a little more strategy added into the whole mix. Now you can't wholly rely on one monster because of the music style affinities. This makes some game elements have more complexity, which may be a bit better even if it meant being slightly less easier.