What a great game!
I just finished it, getting 'Triple Perfect+' on every level. This game is not for everyone. but I loved the difficulty and I would recommend it whole heartedly.
My biggest problem is that upon perfecting every level, there is cannon challenge. The cannon must be fired at a very precise moment in order to hit the bullseye of a target. This is the difference between a 'Perfect' and a 'Perfect+'
This is very annoying when you've just completed a level perfectly, skipped the checkpoint (grants 50,000 extra points) and made it to the end; because if you miss the bullseye, you must start the whole level over again.
Other gripes include the multiple intro screens before the main menu (I don't need a recap of what happened in the previous game every time I load up) and one level where you must to jump up some stairs while kicking, which wouldn't be a problem if the buttons where mapped differently, but there isn't any option to configure the controls.
Regardless of minor issues, this is still a fantastic game.