1. Make shadows darken mobs below/on one.
2. Variant of zombies (Missing squares? lolz).
3. Add swamps where it slows down players
4. Allow parts of zombies to be blown off C:.
5. On-screen ammo counter.
More could be added later C:
Edit:It's been later.
6. Decrease Damage , or Increase Zombie Health.
7. Shorten Melee Distance just a pinch C:
8. Zombie Square Dogs :D (Fast) C: