The game works much better with an Avenue Pad 3. Although it wasn't made for the pad (came out before), the fact that it uses three buttons makes it much easier play with AvePad 3.
Basically, you have a ship that can rotate its guns all around. So there's a rotate counter clockwise button (Run), shoot (II), and rotate clockwise (I). I believe this is the same config as Forgotten Worlds. Haven't played either game in a while, so I might be wrong.
Anyway, I thought Barunba was a decent game. Nothing particularly amazing about it, but I liked being able to rotate the guns around.