I'm not sure how I feel about the departure from the use of dance pad controls, but the fact that I needed to buy an otamatone controller to properly play the game was certainly something I didn't foresee before downloading. I think maybe having some alternate controller schemes would be really good.
The creature collector element was much more pronounced in this entry, which I appreciate a great deal as a fan of the genre. The ability to capture monsters in the labyrinth and then play classic songs to boost their abilities was absolutely transcendent... Even if I could only get 100% accuracy on Twinkle Twinkle Little Star.