Thanks for bring this up.
I'd played the original World of Goo that was developed for the Contest, but never got around to getting the full version as I though it was Tad overpriced.
As I like to Pay for and support Independent Game developers, This offer Let me get a good game, and pay a reasonable (Though Lower) price.
I'll also suggest fans of independent games try out Blurst Games
. While they started out and still primarily focus on browser based games, they've recently started offering those as download ables, which has turned into quiet a time sink for me