Done! Machine gun now drops first with proper stats: 150 rounds, faster fire rate, and lighter damage per bullet for sustained fire.

**Next Ideas:**
1. **Weapon Switching** - Press 1/2/3 to swap between unlocked weapons instantly
2. **Enemy Variants** - Add fast runners, heavy tanks, and exploding suicide zombies

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