An old Japanese tale (火垂るの月 Hotaru no Gatsu) tells the story of fire flies descending from the moon. 
Once upon a time they left for earth and ever since can't find their way back home. In the night they appear and bathe in the moonlight. Try to collect all appearing lights with your fireflies. If you collected the right colours the fireflies can fly back to the moon. Your experience enhances as each level adds a new layer of music. 
The day we are born we start to play. And through playing we learn. We learn to talk, be creative, we learn about empathy and strategy, through playing we get to know our and others' limits. And since the way we learn nowadays is changing, the way we play also changes.