I've created a Sword vs Spear Arena game! Open `index.html` in your browser to play.

**Game Features:**
- **Sword Fighter** (red): Gains +10% damage on each hit (needs 5 hits to win)
- **Spear Fighter** (cyan): Grows 15% longer on each hit (needs 250% length to win)
- Both fighters bounce around the arena like billiard balls
- **Parry Mechanic**: Press `D` (Sword) or `K` (Spear) to block and deflect attacks
- Particle effects, screen shake, and glowing weapons on power-ups

**Next Ideas:**
1. **Power-Up Drops** - Spawn random pickups that temporarily boost speed, add a shield charge, or reset opponent's progress
2. **Arena Hazards** - Add spinning saw blades or electric barriers that bounce fighters and deal damage on contact

**Ready to level up your game? Pick one and let's build it!**