The user wants me to build a Wolfenstein 3D-style raycasting maze shooter in a single HTML file. This is a classic game that uses raycasting to create a 3D effect from a 2D grid map.

Key features needed:
1. Raycasting engine to render 3D walls from 2D map
2. WASD movement controls
3. Arrow key or mouse turning
4. Textured walls (procedurally generated, no external assets)
5. Enemies that can be shot
6. Canvas-based rendering
7. All in a single HTML file with inline CSS and JS

Let me plan the implementation:

1. **Raycasting Engine**:
   - 2D map as a grid of integers (different values = different wall textures)
   - Player position (x, y) and viewing angle
   - For each column of screen, cast a ray and calculate distance to wall
   - Draw vertical strips based on distance (fish-eye correction)
   - Texture mapping using procedural textures

2. **Procedural Textures**:
   - Generate textures using canvas patterns (brick patterns, etc.)
   - Different colors/patterns for different wall types

3. **Controls**:
   - W/S: move forward/backward
   - A/D: strafe left/right
   - Arrow keys or mouse: turn left/right
   - Space/Click: shoot

4. **Enemies**:
   - Simple 2D sprites (billboards)
   - Enemy AI (move toward player, shoot back)
   - Health system

5. **Game State**:
   - Player health, ammo, score
   - Enemy positions and states
   - Minimap
   - HUD

Let me build this comprehensive game:

I've created a comprehensive Wolfenstein 3D-style raycasting maze shooter in a single HTML file. Let me verify it was created successfully.

Great! The file has been created. Let me summarize what I built:

1. **Raycasting Engine**: Full DDA (Digital Differential Analyzer) raycasting that calculates wall distances and renders textured walls
2. **Procedural Textures**: Generated 4 different wall textures (brick, stone, metal, wood) plus floor and ceiling textures
3. **Controls**: 
   - WASD for movement
   - Arrow keys or mouse for turning
   - Space/Click to shoot
   - R to reload
   - M to toggle minimap
4. **Enemies**: Sprite-based enemies with:
   - Pathfinding toward player
   - Line-of-sight detection
   - Shooting capability
   - Health system
   - Hit feedback
5. **Game Features**:
   - Health, ammo, and score tracking
   - Minimap with toggle
   - Win/lose conditions
   - Start screen
   - Fish-eye correction
   - Distance shading
   - Weapon bob animation
   - Muzzle flash effect
6. **Rendering**:
   - Textured walls with proper texture mapping
   - Z-buffer for sprite ordering
   - Proper occlusion culling
   - Distance-based shading

The game is fully self-contained with no external dependencies - all textures are procedurally generated using canvas operations.