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 6 star Hack. It comprises a level and an overworld. There can be nothing unlocked by the 6 stars, so do not expect too much. The level is a 2.5D level, aka 2D movement in 3D environment. I wanted to try this level style for once. That's basically, why this here exists.