Super Isaac'n or Robby is the boss of Robot Island.
The Robot boss is like a more difficult version of the helicopter boss. He will float back and forth at one particular height, and then he will adjust to a new height before resuming his pacing. As he walks back and forth, he shoots rockets from his hands, and on occasion, he will release a spread of fire. Try to jump up to his level and attack him with rainbows while he is moving away from you. If he is low on the screen, try to jump up to the platforms and attack him from above by crushing him with rainbows.