I had to factory reset my iPhone 5 and when I used my computer to restore and reset it "World of Goo" was one of the apps that didn't load. It's still showing in my list of apps and the icon says it's downloaded. When I click on it I get this error message:
The app “World of Goo HD” could not be used because the original file could not be found. Would you like to locate it?

Any ideas about where it went? What to do next?
Many thanks.