We are building a single-page web app with all code in one index.html file.
 The game is a tile-based platformer in the style of Dangerous Dave.
 Features:
   - Navigate a level to grab a trophy and then reach the exit.
   - Avoid hazards like fire and water.
   - Jumping and simple enemies.
   - Procedural graphics (no external assets).

 We'll use HTML5 canvas for rendering.

 Steps:
 1. Set up the HTML structure with a canvas.
 2. Define the game state (player, level, enemies, etc.).
 3. Implement game loop (update, render).
 4. Handle user input (keyboard for movement and jumping).
 5. Design a simple level with tiles (platforms, hazards, trophy, exit).
 6. Implement collision detection (tile-based).
 7. Implement player movement and jumping (with gravity).
 8. Implement enemies (simple movement, maybe patrolling).
 9. Implement game logic (collect trophy, then exit).

 Let's break down the code:

 HTML:
   - A canvas element for drawing.

 CSS:
   - Basic styling to center the canvas.

 JavaScript:
   - Game constants (tile size, canvas dimensions, etc.)
   - Level data (a 2D array representing the level)
   - Player object (position, velocity, state)
   - Enemy objects (array of enemies)
   - Game objects (trophy, exit)
   - Functions: update, draw, input handling, collision detection

 We'll use a fixed tile size (e.g., 32x32 pixels) and a level that fits the canvas.

 Let's create a level with:
   - 0: empty
   - 1: platform (solid)
   - 2: hazard (fire/water)
   - 3: trophy
   - 4: exit (initially inactive until trophy is collected)
   - 5: enemy

 We'll design a simple level for demonstration.

 Note: We are not using external assets, so we'll draw everything with canvas 2D primitives.

 Let's code accordingly.

I've created a complete Dangerous Dave-style platformer in a single HTML file. The game features:

**Game Features:**
- Tile-based platformer with procedural level generation
- Player character with movement (arrow keys) and jumping (spacebar)
- Collectible trophy that must be grabbed before reaching the exit
- Hazards (fire) and enemies to avoid
- Multiple levels with increasing difficulty
- Lives system and scoring

**Key Mechanics:**
- **Platforms**: Brown wooden platforms you can walk on
- **Hazards**: Red fire tiles that damage the player
- **Enemies**: Red ground enemies and teal flying enemies
- **Trophy**: Golden trophy that activates the exit when collected
- **Exit**: Green door that appears after trophy collection

**Controls:**
- **Left/Right Arrows**: Move horizontally
- **Spacebar**: Jump
- **Reset Game**: Restart from level 1
- **Next Level**: Skip to next level

**Procedural Graphics:**
All graphics are drawn programmatically using canvas:
- Player character with directional facing
- Animated fire hazards
- Different enemy types with visual details
- Trophy and exit markers
- Platform textures

The game is fully self-contained with no external dependencies. You can open `index.html` in any modern browser to play immediately!