Cool albeit cryptic flash video game. My best score is 103, my moving "countdown" circle turned a magenta square orange and that somehow ricocheted to expand the big "combo" circle. Knowledge of Japanese not required. :-)
Update: Fuller explanation of the game:
Click on the left mouse button to change the color of your circle, then collect the corresponding objects on screen to build your combo count. Energy is lost whenever your circle collides with an object that is of a different color.
A combo box appears when you have several combos going. Switching colors when your circles is hovering above any of these boxes will cause a variety of effects, dependent on your current combo count. Grey objects tend to chase after your circle. Blue circles float horizontally and red ones move vertically.