Puzzle games usually introduce their rules over the course of the game, so they stack on top of each other as the player improves. This game sort of just throws them all at you in a tutorial world, which I assume makes it easier to sell $1 level packs. Sign of the times?

Edit: Learning from OnlineSamantha's review that the tutorial world is actually updated as the expansions add new rules... so after the tutorial, the worlds are more monotonous. Yikes.