It's only $5, it's tied for my favorite game of last year, there is literally no reason not to buy it now. I'm buying it again for PC (yay mods).
World of Goo is love.World of Goo is a multiple award winning physics based puzzle / construction game made entirely by two guys. Drag and drop living, squirming, talking, globs of goo to build structures, bridges, cannonballs, zeppelins, and giant tongues. The millions of Goo Balls that live in the beautiful World of Goo are curious to explore - but they don't know that they are in a game, or that they are extremely delicious.
World of Goo on Steam
91.9% on Gamerankings (94.4% on Wii, exact same game) World of Goo for PC - GameRankings
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