It's only through a carefully choreographed series of movements that you will be able to survive a level. The game admonishes you to 'keep calm and avoid everything,' and that is sage advice, even if it is difficult to follow. The wall that you hit also is stained with the 'blood' of your circle and these blood stains increase every time you fail. If you hit a wall, you die and are tossed back to the beginning of the level. The circles interact with walls that fall down the screen, and your challenge is to spin the circles to avoid the walls.
The ring is there for visual purposes and serves only as a reminder of the track that the circles spin on. In Duet, you use your thumbs to control two circles that are placed on the opposite sides of a ring. Duet from Kumobius takes a simple action of spinning two dots in a circle and turns it into a challenge by adding some upbeat, yet eerie electronic music along with a impending sense of failure that hangs over your every move.
