I think the part that can be confusing are:
(1) The two-part "currency" system. You buy challenges with "crystals," then to actually play the challenges, you have to have enough "resources" to play them.
(2) Figuring out what the various tools do and how to use them. That one took me a while, and I still haven't quite mastered how to use them to best advantage within the game!
(3) The fanciful names for various tools and skills are a nice touch as far as immersing yourself in a fantasy world, but how are we supposed to remember whether Nothern Breeze is a higher skill level than Eastern Breeze?
(4) Let's not get into all the various weapons, armor and accessories. I'm just assuming they will eventually be used in future levels of the game!