Game is about controlling the heart's pulse on normal rythm. Virusses and bacterias are attacking to heart through the veins and causing heart pulse to get high. You must build your defance towers with leukocyte points and destroy them.
It is a tower defense game. Every enemy has own way to finish. And the towers are defensing the way. Every tower has own sound and rhythm. And the green row timer for making random music by enemies' positions.