Hardest is a matter of opinion.
The game style, with a top-down overworld and a side-scroller most of the action and stuff throws a lot of people off that it's an old Zelda game, and things like ducking and jumping while strategically fighting are necessary to effectively play this game. Instead of the "A-sword, A-sword, A-sword" it's much more complicated in a generally-considered simple gaming period. But personally, I've played a lot of games of the same type and this one was fairly easy to me.
If you've never had experience with this type of game, since it's not really like Zelda, but if you've ever had experience with that style of game this one is really much easier than most.