animated characters, Cuphead and Mugman, co-op gameplay, online multiplayer, vintage cartoon style, exaggerated expressions, run and gun, 1930s animation aesthetics, vibrant colors, dynamic poses, shooting action, dodging bullets, boss battle, whimsical environment, forest background, retro gaming, high contrast shading, smooth animation, 2D side-scrolling, inkwell isle, whimsical soundtrack, exaggerated finger guns, rubber hose limbs, grainy texture, cel-shading, cross-platform play, split-screen, chaotic energy, teamwork, power-ups, collectible coins, challenging levels, parry mechanic.