Operation C is an action game released for the Nintendo Game Boy in the USA. Details regarding the original developer can be hard to find in general sources.  Gameplay likely involved side-scrolling action, shooting, and possibly stealth elements, which were common in action games of the era.  The "Operation" part of the title suggests a military or espionage theme.  Information on the game's overall reception and detailed gameplay features may need to be sourced from gaming archives that focused on Game Boy releases from that period.

Operation C (USA)

Oni IV - Kijin no Ketsuzoku (Japan)