Oniken is a retro-inspired side-scrolling action game drawing heavily on classic 8-bit era titles, following the ninja mercenary Zaku as he battles the Oniken, a military organization ruling a post-apocalyptic world. Its punishing difficulty and pixel-art style pay homage to genre classics.

Players fight through tough, precisely designed levels using sword attacks and grenades, mastering timing to survive relentless enemies and bosses. It's built for fans of hardcore, nostalgic action-platformers.