Some important improvement ideas

Thanks for the feedback. Just a note on number 7, as you get more experienced with the game and your gamestage goes up you'll find that there are random wandering hordes and that your gunshots can attract screamers who will spawn in loads of zombies.

Wandering hordes are designed to pass nearby up to 30 blocks away rather than head straight at you. When your gamestage and level are low there may only be 3-5 zombies in the group and you may not see them or they see you. But later there will be larger groups of zombies and you'll be more likely to notice them passing by. If you turn feral sense on in the settings they will be more likely to sense you and come to get you whenever they pass by.