Very fun puzzle game. I played it yesterday and I just had to play the story again today. Lunatic was too much for me, but the story mode difficulty was just fine.
Regarding the blocks, I agree with Fiore; I can’t quite put my finger on it, but I kind of feel that the icons are too big or the colors are too saturated, so the board looks a bit noisy, visually speaking. This is compounded when the blocks reach the top of the screen and they get crushed.
The UI is pretty neat. And great choice of music, I wouldn’t have guessed that the songs were from Nicovideo Commons. All of them fit the game very well.