Nebula Strike Shooter

Create a polished single-file HTML5 shooter called Nebula Strike.

Hard constraints:
- Embedded HTML/CSS/JS only; no external assets, analytics, APIs, or network calls.
- Desktop keyboard and mobile touch controls must both be usable.
- Prefer canvas or lightweight DOM rendering unless another approach is clearly more reliable.

Creative direction:
- Deep nebula backdrop, emissive lasers, readable enemy silhouettes, crisp hit feedback, and a futuristic HUD.
- A top-down, angled, or light 2.5D perspective is fine if it creates stronger gameplay than forcing a heavy 3D stack.

Core gameplay:
- The player pilots a ship, dodges asteroids/enemies, shoots waves, and survives escalating pressure.
- Include burst fire, a short shield or dash ability, score streaks, lives/HP, wave indicator, power-ups, start/game-over overlays, and restart.
- Controls: Arrow keys/WASD to move, Space or button to shoot, Shift or button for shield/dash.

Quality gates:
- Enemy attacks must be telegraphed before they hit.
- Player movement should feel responsive.
- The first minute should contain at least two enemy patterns and one power-up moment.