"Create a pixel art sprite sheet for a 2D top-down game: - Each frame sized 32x32 pixels - Transparent background - 12 Vietnamese zodiac animals (rat, ox, tiger, rabbit, dragon, snake, horse, goat, monkey, rooster, dog, pig) - Each animal has walking animations in 4 directions: - 4 frames walking down - 4 frames walking up - Frames arranged in rows, each row is one direction animation for one animal - Style: cute chibi, 16-bit retro pixel art - Bright colors and clean outlines suitable for GameMaker 2D top-down games - Clear grid layout for easy slicing into individual frames "