Tip: You can use Lunar Magic's Overworld Layer 3 Editing system to edit or create your own layer 3 images (castle bricks, fish, rocks) and apply unique effects per level via the Layer 3 Bypass in the main editor.
This is a short kaizo:light hack.
The difficulty changes, it's somewhat easy at the start but gets harder as the end approaches. For any questions/problems, ask me.
The tracks used in the hack are in the README file.