A fun entry. I always liked Tetris and all the spinoffs that it led to (not that I was particularly good at it, mind).
Graphics are simple but clean. The sound effects somehow sound ethereal... I never got tired of listening to that lovely chime.
Although there is a clock, I never felt the same urgency as I do when playing Tetris. Not sure what can be done to ratchet up that tension. A shorter clock, which can only be satisfied by making 3x3 blocks faster?