two characters, Cuphead and Mugman, cooperative gameplay, side-by-side, vintage cartoon style, vibrant colors, 1930s animation, dynamic poses, shooting action, dodging projectiles, boss battle, whimsical environment, forest background, exaggerated expressions, retro gaming, split-screen view, detailed textures, fabric-like material, rubber hose limbs, inkwell isle, soft lighting, high contrast, 2D platform, hand-drawn aesthetics, co-op mode, seamless interaction, teamwork, vintage microphone, grainy film filter, action-packed scene, fun and challenging.