Mathys-Hymon contributed to both the WS-Vehicle-ArtFX and TheForgotten repositories, focusing on gameplay stability and user experience. In WS-Vehicle-ArtFX, he addressed a persistent collision detection issue by modifying Unreal Engine assets and static meshes, which improved level reliability and reduced related bug reports. For TheForgotten, he restored the playable state of the Labo level, enhanced door interaction audio, and refined core gameplay assets such as flashlight behavior and character size. His work relied on Blueprint scripting, UnrealScript, and audio engineering, demonstrating a methodical approach to asset tuning and level design that improved consistency and workflow for game development teams.