animated characters, Cuphead, Mugman, Ms. Chalice, new character, 4-player mode, retro style, 1930s cartoon design, exaggerated expressions, running, shooting, vibrant colors, smooth animation, boss battle, whimsical environment, forest background, platformer action, cooperative gameplay, vintage grain texture, dynamic poses, side-scrolling view, bright and bold outlines, exaggerated finger guns, inkwell island, whimsical soundtrack, high-energy, rubber hose limbs, soft lighting, clear foreground, detailed background, action-packed, multi-character composition, fun and challenging.