Presentation is top notch. Characters lack variety, though, all being petite girls/guys and one bishounen. The Japanese VA confused me, since this is clearly a Western game. I think the cube should be transparent, or there be some other way to improve visibility, since only 3 faces of the die are visible at any one time, but you need to know all 4 cardinal sides to play correctly.
The game progressively becoming harder at the timer passes is brutal. At some point you become stuck and have to watch yourself slowly be boxed in to death. I get that's how Tetris works, but this puzzle is far less intuitive and less user friendly. Overall this is a very difficult style of puzzle game which I don't see reaching mass appeal. The presentation is amazing, but I don't think this gameplay type justifies the effort.