Neon Flow Grid Snake

I want you to act as an expert HTML5 Canvas game developer. Your task is to write a complete, playable SINGLE FILE (index.html) game based on a modernized snake mechanic. GAME SPEC: Title: Cyber Grid Link Core mechanic: Control a snake made of chained vector particles on a shifting grid environment. Goal: Collect glowing energy matrix crystals to grow the link chain while dodging moving firewall barriers. TECH REQUIREMENTS: Single file: Pure vanilla JS inside one HTML document, zero extern...