Done! Zombies now deal damage when they touch you, your health decreases, and you get that red screen flash just like House of the Dead. Die when health hits 0.

**Next Ideas:**
1. **Health Packs** - Drop glowing green health items from killed zombies to keep you in the fight
2. **Weapon Upgrades** - Add shotgun or machine gun pickups with different damage/fire rates

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