**Planning a game structure**

I'm thinking about creating an index.html file where I can build the game. I need to set up a canvas and controls for keyboard and touch. The ship will have mechanics like rotation and thrust, plus inertia and friction. The asteroids will be represented as polygons and will split or be destroyed on impact. For collision detection, I might use the traditional distance method. I'll also consider features like score and lives display, along with game controls like arrow keys and space for shooting.**Creating game components**

I'm considering adding simple UI instructions and sound effects, like using WebAudio for beeps, though it isn't necessary. The plan is to structure the code well while crafting the index.html file. For the ship, I’ll draw a triangle that rotates and uses a flame effect when thrusting. The asteroids will be created as jagged polygons using random angles and radii. For collision detection, I can approximate the ship as a circle for simplicity. Additionally, I’ll implement bullet collisions and have asteroids split based on size, starting the player with three lives. The score will change based on asteroid sizes.**Structuring game states**

I’m working on defining game states like 'start', 'playing', 'dead', and 'gameover'. I want to include text overlays for clarity. I'll implement a respawn mechanic with invulnerability that blinks. For seamless wrapping of asteroids when they move off-screen, I’ll create duplicates at offsets. Even for bullets and the ship, I might create duplicates for visual correctness, although it could be simpler. I need to focus on maintaining collision detection based on original positions, and I’ll use requestAnimationFrame for timing. Finally, implementing a restart feature and local high score storage will be helpful!