Nah world 5 is rubbish. The last level was the icing on the cake. Pretty poor imo. The first couple from world 6 looked good though.
I'm also not sold on the 'more galaxies, but with less stars each' concept of this game. The great thing about the original as I mentioned above, was that each galaxy was very creative and felt really polished, you got to know it quite well. This game seems to have gone for quantity, and you manage to breeze through them without really giving them much though. Add to that the fact that some of the later galaxies really are very uninspiring and lazy, and I'm not quite sure they got the mix right personally, but hey ho, still loving it.