Simple shooting game.
Shoot at the black sea urchins to save the planet.
When the black sea urchins land on the planet, the planet will...
You are white sea urchin.
You can shot a fire and the fire can destroy the black urchins.
Sometimes a shooting star falls and you should avoid it
otherwise you will be destroyed.
Score is added with duration.
when the black sea urchin land on, score will be fixed and the game will be over.