I hear Sakura Samurai: Art of the Sword is a pretty decent game. Although, I haven't played the whole game myself, but I've seen others play it, and it looked pretty fun. Only ranging to about 7-8 dollars ($7, I've heard), this game could be a game of your liking.
For such a simple game, the game is unique, and fulfilling. The action and adventure is pretty nice, too. The game includes sword fighting combat, where you slash your opponents, defend, use special attacks, etc. The game combat is a thrill ride of fun, since you have to fight many different enemies, and you just have this feeling where you want to continue. The storyline is pretty decent, too. The game seems like a fun game, or at least, to me.
I may have gotten little first-hand experiences, but I can just say, from seeing others play the game and a little gameplay from me, the game is a great addition to the 3DS Library. The style, the music, and the combat of the game is just amazing.