Serpent is a USA Game Boy release, the specifics of which are currently unclear. Without additional information, it's difficult to determine the genre or style of gameplay.  The title alone suggests a possible adventure or puzzle game, perhaps involving exploration, strategy, or a focus on the serpent itself as a central character or element.  More details on the game's development and release are required.

Serpent (USA)

Selection II - Ankoku no Fuuin (Japan)