The user wants me to create a single-page web app with Phaser.js for a top-down alien shooter game. Let me break down the requirements:

1. Single file: index.html with inline CSS and JS
2. Use phaser.min.js (already present in directory) - load with <script src="phaser.min.js">
3. No external resources, CDNs, or network requests
4. Game features:
   - Top-down alien shooter
   - Move with WASD
   - Aim and fire at waves of advancing aliens
   - Health system
   - Score system
   - Increasing difficulty
   - Procedurally generated graphics (no external assets)

I need to:
1. First check if phaser.min.js exists in the current directory
2. Create index.html with all the game code

Let me start by checking the current directory and then create the game.

Good, phaser.min.js is present. Now I need to create a complete top-down alien shooter game in a single index.html file. The requirements are:

1. Single-page web app with all code in index.html
2. CSS in <style> tag, JS in <script> tag
3. Load phaser.min.js with <script src="phaser.min.js">
4. No external resources, CDNs,

The user asked me to build a top-down alien shooter game using Phaser with specific requirements:
- Move with WASD
- Aim and fire at waves of advancing aliens
- Health, score, and increasing difficulty
- Use ONLY procedurally generated graphics (no external assets)
- Put everything in one index.html file
- Load phaser.min.js from the local file

I created the game with:
1. A player that moves with WASD keys
2. Mouse aiming and clicking to shoot
3. Waves of aliens that spawn with increasing difficulty
4. Health system (starts at 100, loses 20 per hit)
5. Score system (increases with each alien killed, multiplied by wave number)
6. Procedurally generated graphics using Phaser's shape primitives (circles for player, aliens, bullets, eyes, etc.)
7. Visual effects like explosions, muzzle flashes, screen shake
8. Game over screen with restart functionality

The game is complete and should work. Let me verify the file was created