Gordon Freeman, male protagonist, HEV suit, crowbar, action pose, fighting headcrabs, Black Mesa Research Facility, industrial setting, sci-fi environment, rusty textures, metal corridors, flickering fluorescent lights, emergency alarms, explosive barrels, alien creatures, Xen flora, first-person perspective, dynamic shadows, intense combat, 3/4 composition, atmospheric lighting, detailed textures, high-resolution, immersive experience, Valve, iconic video game, GOTY edition.