I can help you build ROOKIE ONLINE. What would you like me to create first?

Some starting points:
- **Game prototype** (choose engine: Phaser, Three.js, or vanilla Canvas)
- **Server architecture** (Node.js + WebSocket for multiplayer)
- **Core systems** (combat, progression, inventory)
- **Specific feature** (skill system, crafting, PvP arena)

What should we build?