Cutely frustrating!
There are several hard things about this game. Controls are one of them. You hold the Wii remote Sideways and tilt it to move, shake it up to down or side to side for either wind or earthquake effects. The puzzles are kind of confusing too. Many of them are multi-step and require thinking carefully. Lastly, Dewy has this annoying thing where, yes, he can change the weather, but...he can't make it last very long. Like when your in an ice place and your being ice Dewy. The weather drops, Dewy melts, and you lose some of his life. It's really annoying.
But some good things about this game are just as powerful as the bad.
Like Dewy, he's a good thing. His cuteness just makes you not want to give up. Just keep going, for Dewy's sake! Another is the bosses. They range from easy to OMG HOW CAN I BEAT THIS??? Again, if you get that last kind of boss, maybe Dewy can cheer you on. XD Lastly, the flow of the game is simple and easy to read, making the game easier to play.
So, Dewy's Adventure has a very fun and frustrating style. (Sounds like an essay, huh? XP)