I purchased this via the Wii shop channel two weeks ago, and I totally agree with all the "Game of the Year 2008" proclamations. It is a really fun and addicting game. I finished the game in about 5-6 hours, but I've been working on getting OCD on as many levels as I can, and am up to 12 hours. I really hope they make a sequel!
I highly recommend any Wii owners to buy it if they haven't already.