The Maekgaibo's sprites received the most visual revisions.
From left to right: The original spinning enemy from CGA; The four-bladed version from the CG2A mockup; The version used during most of development; Three attempts to reduce the maximum visual height of the blade by a pixel, the final version used in-game.
The additional blades were dropped to make for clearer animations (originally, the two sets of blades were planned to rotate in opposite directions, and visually it was cluttered). The reduction in height was to allow for visual clearance as the player ducks from their desired duckable height.