I have the game, it was the first game I downloaded when I got my 3DS way back when. It's just the multiplayer mode from the other DS Bomberman titles I've played. Oh well, it's a Bomberman on the eShop and that's good enough for me.
It's great for what it is, but the lack of a single player mode, and no online support makes it get old fast. I still come back to it from time to time.