Great, familiar gameplay, with new ideas. Easily one of, if not the best portable Zelda game.
The map of Hyrule may seem small, but the ways to get to the dungeons are quite puzzling and great. The maps are beautifully made, and do not usually bore you. Hyrule castle town is a bustling town with people running around and different shops everywhere.
Also, the new aspect of the game, becoming minish sized, is very innovative. It is wonderfully implemented into this game. For example, there are treasures obtainable only when you are tiny, and little places that you can fit through. It is also used in the dungeons, too, to solve puzzles. The sidequests that are required to complete the main quests are great and require you to go all over the land, being tiny and large.
You will probably get instantly addicted to this extremely fun addition to the zelda series.