I tried the demo and liked it enough for a buy. Today I'm not sure if I made a good choice or not. The game is quite fun for the most part but it gets quite hard. I haven't been able to finish it yet due to the fact that the last level of each world is locked until you get enough stars on the rest of the levels of that world.
So get the trial and test it out but the difficulty of the trial levels is nothing compared to the skill it demands to even finish the game.