EDIT: damn! missed deadline... story of my life...
Mr. & Mrs. Tumbleweed
The poor old couple have been living in their house for most of their adult life. No storm is going to change that! Help them smack away cars, elephants, fishes and even tumbleweed that the storms are launching at them! Make it a touch-screen coop game where two players help out smacking away the stuff which the storms are launching at their precious house. Larger things require more smacking.The players are immortal but the house takes damage.
Here is a sketch I made: