Easy enough:
On second thought, here
http://hrwiki.org/index.php/Space_Circus_Catastrophe
I was going to write about controls, but I dunno if you got a Wii or PC. Either way, your controls are listed there.
Shoot Clowns with missiles, Save circus performers with bubbles, and move out of the way of food that comes your way. (If a peanut comes from the left side of the screeen, you'd dodge right)