I own it for GameGear, didn't know they made it for SMS... it's basically a Roguelike/dungeon hack type game. Very similar to Azure Dreams w/o the town building. It was fairly fun for its time, though I vastly preferred playing Defenders of Oasis for that system. But yeah, basically you run around, every space you move, the enemy moves one space, and you trade blows one at a time with them.
I guess it could be fun for a cell phone.