Is there more to the app than a sudoku rehash, a Rush Hour rehash, Sokoban, and a sliding tile game? I mean, those are all reasonably nice puzzles and should be easily worth a $1 download just as is, but that seems like a crazy amount of activity for slight variations to common puzzles wrapped up in some pretty gloss.
By dismissing immaculate execution and over a year's worth of work from some of the top game & visual designers in the iPhone industry as "some pretty gloss" you're completely missing why it (and almost every other Tap Tap Tap app) has went #1.