Steve is right on both counts, all you need to do is place the objects into the game area and attempt to fill at least 65% of the screen. Gravity is also in play and as the objects are very slippy, you'll find them constantly moving around as you strive for the percentage goal.
The update adds in support for Mango, and a new ad network to help support the developers efforts. Grab your copy from the AAWP App Directory, or update it on your device from the Windows Marketplace.