video game, Atomic Heart, mature rating, intense action, futuristic weapons, robotic enemies, dystopian environment, abandoned facility, overgrown vegetation, rusted structures, eerie atmosphere, dynamic lighting, first-person perspective, detailed textures, high-resolution graphics, immersive sound effects, suspenseful soundtrack, advanced particle effects, realistic physics, interactive objects, complex AI behavior, post-Soviet setting, mutated creatures, survival elements, resource management, strategic combat, moral choices, branching narrative, atmospheric tension, psychological horror elements, mature themes, adult content, 18+ audience.