Fantastic Night Dreams: Cotton

Cotton: Fantastic Night Dreams is a scrolling shooter game reminiscent of Parodius where players assume the role of a young witch named Nata de Cotton who, alongside her fairy companion Silk, travels various increasingly difficult levels through a fantasy dream-like world on a quest to defeat several monsters and get her Willow candy.

Played in monochrome mode that's triggered if the cart is inserted into an original Neo Geo Pocket, some sprites look different when playing in black and white e.g. magic medals.