Vertical Pixel Art Asteroid Field

Create a vertical retro pixel-art space shooter background, 9:16 mobile game aspect ratio, designed as a seamless-feeling scrolling level backdrop. The scene is deep outer space with a dark navy-to-black starfield and a wide empty central flight corridor for gameplay. Add two luminous blue nebula streams running vertically along the left-center and right-center edges of the corridor, with speckled cyan particles, small bright stars, and occasional star glints. Surround the corridor with an asteroid field: exactly 34 visible rocky asteroids of varying size, irregular jagged shapes, dark charcoal surfaces, and electric blue rim lighting. Count and place them as follows: 1 huge cropped asteroid in the upper left corner, 1 huge cropped asteroid on the mid-left edge, 1 large asteroid near lower-left edge, 1 large cropped asteroid at the bottom-left corner, 1 large asteroid near upper-right edge, 1 large asteroid near mid-right edge, 1 large cropped asteroid on the lower-right edge, 1 large asteroid near bottom-right, plus 26 smaller floating asteroids scattered around the left and right sides while keeping the center mostly open. Include a large blue planet cropped into the upper-right quadrant, glowing atmospheric rim, visible curved horizon, subtle surface texture, and bright cyan edge light. Visual style: crisp high-detail pixel art / 16-bit inspired game asset, dramatic blue lighting, strong contrast, no blur, no UI, no spaceships, no characters, no text, no watermark. Use dominant color, aspect ratio, central gameplay corridor, planet position, and asteroid count.