So the only types of NPC's in the game so far are zombies, and bats. I think there should be more. Maybe add a herd of cows or pigs or something, to spice up the game a little. You could find them on the map, and they'd be just like animals in vanilla minecraft. If you were in need of food, you could kill them for rotten steak. Also the zombies would chase the animals and would kill them if they caught up to them somehow. Just a small idea. Thanks for reading.