Zhan Ye Ren demo now live: how does this Chinese Metroidvania interpret the underworld system?

Bilibili's Game Preview platform revealed Karma Slayer today, a domestic side-scrolling action game with its Playtest now live for a limited time. The design framework points to a Metroidvania-style single-player premium title, but its angle is distinct—rebuilding the underworld through Chinese mythology.

The developers introduced an intriguing premise: karma functions like an invisible magnetic field, shifting the balance across three realms. This suggests player choices could alter world states rather than following linear progression. Traditional elements like Meng Po's soup and the Eighteen Layers of Hell receive fresh interpretations, creating an afterlife realm that feels both familiar and foreign. If executed well, this karma system could branch each playthrough into different routes—like a chess endgame where every move carries consequences.

The challenge lies in Metroidvania fundamentals: interconnected map design and ability-unlock pacing. The trailer shows solid atmospheric work—caves, ruins, forests each have distinct visual identity. But the real test for the team is whether the map complexity holds up, whether backtracking yields meaningful discoveries, and whether boss fights demand tactical thinking over mindless dodge-rolling.

Domestic side-scrollers aren't rare, but few deeply integrate mythological themes with Metroidvania mechanics. If Karma Slayer invests in decision depth—making the karma system genuinely affect gameplay rather than just numerical tweaks—it gains competitive differentiation. The Playtest is open now. Players who favor strategy-driven action games should try it and judge whether this underworld framework represents thoughtful design or wasted potential.