Let's create a classic snake game with the functionalities you've described. The snake will be controlled by the arrow keys and will grow as it picks up colored dots. The speed will gradually increase as the snake eats more dots.
Here's the HTML, CSS, and JavaScript needed for this game:
```html
Classic Snake Game
Score: 0
```
### Explanation:
1. **HTML/CSS**:
- The HTML defines the canvas element where the game will be drawn and a div to display the score.
- CSS centers the canvas on the screen and styles the score.
2. **JavaScript**:
- Initializes game variables including the `snake` array, `speed`, and the initial direction (`dx`, `dy`).
- Contains functions to update the game state, draw the game, handle collisions, and change direction based on key presses.
- The game loop uses `window.requestAnimationFrame` to continuously update and render the game.
When you open this in your browser, you will have a classic Snake game where the snake grows as it eats colored dots and increases in speed with each point. Have fun!