I must not use external resources or network requests. I must use the pre-provided phaser.min.js file via a <script src="phaser.min.js"></script> tag. I need to build a top-down alien shooter game in a single self-contained index.html file.

Let me first check what's in the current directory and examine the phaser.min.js to understand the Phaser version and API style.

The final response outside the thinking tags will be the tool calls, if any.

The user wants a single-page HTML file with Phaser 3 game - top-down alien shooter. WASD movement, aim/fire, waves of aliens, health, score, increasing difficulty. Procedural graphics only. Load phaser.min.js via script tag.

Let me build this step by step.

I'll write the full index.html file.

Key features:
- Player ship (triangle/polygon) controlled by WASD
- Mouse aim + click to fire (or auto-fire? "aim and fire" - I'll do mouse aim + click to fire)
- Waves of advancing aliens (circles/squares that move toward player)
- Health bar, score display
- Increasing difficulty (more aliens, faster, stronger over waves)
- Procedural graphics using Phaser Graphics objects

Let me think about the structure:

1. Phaser config - simple canvas, no physics needed (or arcade physics for collisions)
2. Boot/Preload scene - just create textures procedurally
3. Game scene - main gameplay

Actually, I can generate textures using Phaser's generateTexture or Graphics objects.

Let me write the complete file.

I'll use:
- Arcade physics for collision detection
- WASD for movement with velocity
- Mouse pointer for aiming direction
- Click to fire bullets
- Enemy waves that spawn and move toward player
- Score and health tracking

Let me code this up carefully.

I always produce a