I'm already in World 3, and I love this game. It's challenging, to an extent, you can usually just fly over everything, and the Power Cells are usually pretty easy to find. I just wish there was an option to quit the level and keep your cells so you wouldn't have to replay the whole thing. >_> Kind of a nuisance.
But I agree with you on the powers, we even get some new ones like the Whip, Leaf, and Water. I personally prefer Cutter, though. I also like how you don't INSTANTLY lose your powerup when attacked, and you run faster while using a Lollipop.
My only regret is that its so short, at this rate, I'll finish the game to 100% with ease! XP I should also consider going back and finishing Epic Yarn too...Still, worth the purchase.