Zolba (ゾルボー) is the boss of stages 1 and 10 from Super Aleste.
Details[]
Zolba appears as a large machine with a orange sphere in the middle. He begins the fight by firing from his four turrets, though these can be easily destroyed. After a while he extends two mechanical arms on each side, forming walls trapping the player inside, then detach the sphere. The sphere rolls on the walls and jumps between them, trying to crush the player, while the boss's core shoots bullet spreads.
Once the sphere is destroyed the walls will also disappear. The boss will then circle around the screen while shooting bullets in eight directions.