De Blob is that it has an uncanny ability to make you forget about time. Many of GameSpy's stages ran for at least a half-hour, and they seldom realized it until the level wrapped and reminded them how long they had be playing. It's a beautifully immersive game that really takes advantage of the Wii's hardware to create a vivid and memorable experience. The challenges can be a bit of a pain at times, and they're not very diverse ("beat up these guys," "paint these buildings"), but they're still a rather fun addition to gameplay.
Blue Tongue succeeds because it has concocted a game that nearly any Wii owner can enjoy, from younger children to grown-up gamers, thanks to its visual splendor and simple but effective gameplay. de Blob will undoubtedly add color and character to anyone's Wii library.