Developed and stabilized the GameManager system for the Leyenda004/PMAP1 repository, focusing on reliable gameplay management and robust architecture. Leveraging C#, Unity, and version control, the work introduced health management, level progression, enemy damage handling, and foundational score and treasure tracking. The implementation used the singleton pattern to ensure a consistent GameManager instance across scenes, refining the game loop with continuous health drain and removing level-completion gating. Addressed codebase stability by reverting problematic merges and reinforced singleton integrity by destroying duplicate instances, preventing orphaned components. These efforts resulted in improved gameplay stability and a solid base for future analytics features.