Innovative gameplay
Good storyline
Great music
Good graphics
The enemies are mini puzzles, themselves
Lots of collectibles
Great for making your own playing style
Lots of varying types of gameplay (platforming, hack and slash, shooter and boxing(?))
Makes great use of the Wii U gamepad
Challenging
Great voice acting
Bosses are big and brilliant
Colourful cast of characters
Its cheesy and it knows it
Weak Points:
Difficulty spikes
Graphics can be a little too shiny
Harder difficulties aren't unlocked straight away, forcing multiple playthroughs through the same story for a real challenge
Some of the Wonder Signs are hard to draw/very similar to others
You aren't allowed very many items
Credits are hard to earn
Hard to get a good score (die and its goodbye platinum, gold and silver trophies)
Ultimate form doesn't actually do anything
Two player requires a pro/classic controller
Ultimate form doesn't actually do anything
Two player requires a pro/classic controller