Submarine Sprint: Cartoon Ocean Game World

A cute rounded submarine with a big glass dome, happy eyes, and a tiny propeller, bright colors (orange hull with teal accents), cartoon style with thick black outlines and flat cel-shaded shading. It sails through a vibrant underwater level in a side-scrolling video game. The scene includes coral reefs, swaying seaweed, bubbles, and friendly fish. Add a playful HUD: score, hearts, and power-up icons in the corners. The background shows parallax layers of reefs and rocks; sunlit water beams; motion lines to imply speed as the submarine swims toward the right, entering a coral tunnel. Style: 2D cartoon, vector-like, bold colors. Mood: cheerful, adventurous, kid-friendly.