Retro Anime Space Adventure Poster

Create a nostalgic 1990s anime-style sci-fi adventure poster set in deep space, with a star-filled blue nebula background, a large Earth-like planet at upper left, a huge cyan-blue alien creature or spacecraft silhouette looming behind the characters, and a futuristic city with antenna towers and domes along the lower horizon. In the foreground, show two adventurous children standing on a reddish rocky cliff: a girl with {argument name="girl outfit" default="a red cropped T-shirt, black pants, pink sneakers, and dark wavy pigtails"} holding a yellow banana-shaped ray gun, and a boy with {argument name="boy outfit" default="a white shirt, brown shorts, white socks, and oversized white sneakers"} raising one hand toward a glowing orange light. Add two cute mascot companions to the right, exactly 2: one tan bear-like mascot with a red shirt and blue scarf, and one smaller gray-brown animal mascot. Fill the sky with a fleet of exactly 24 small triangular cheese-shaped rocket ships, including 3 larger cheese rockets on the left with blue side fins and orange thruster flames, and 21 smaller cheese rockets receding into the distance. Use dramatic hand-painted cel animation colors, high contrast, crisp ink outlines, cosmic blues, orange highlights, retro VHS-era adventure composition, and a theatrical movie-poster feel. Place a large centered vertical rectangular overlay in front of the background and partly covering the giant blue figure and the boy, with a smooth muted gradient from {argument name="overlay left color" default="teal blue"} to {argument name="overlay right color" default="dark gray-purple"}, no text on the rectangle.