Reduced zombie count from 15 to 8 initially, and the wave increment from +8 to +4.

**Next Ideas:**
1. **Boss Waves** - Add special boss zombies every 5 waves with 5x health and unique abilities
2. **Difficulty Selector** - Add easy/normal/hard mode toggle at start with different zombie counts

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