Densetsu no Starfy 2 - The Legendary Starfy 2 (Japanese, Gameboy Advance)

The best first party Nintendo game, we never got in the west! 

Starfy is an action platformer, with a cute twist and amazing visuals for the time. 
The game contains some Japanese text, but can still be enjoyed without understanding the language, as the action is pretty straightforward. 

Condition: Great