Cuphead characters, Mugman, cooperative gameplay, online multiplayer, vintage cartoon style, 1930s animation aesthetics, run and gun, boss battles, vibrant colors, dynamic action poses, exaggerated expressions, hand-drawn textures, watercolor backgrounds, forest setting, side-scrolling view, bright lighting, high contrast, detailed character design, rubber hose limbs, whimsical, action-packed, two players, gaming concept, fantasy environment.