Zombie atack simulator!

I want a good zombie simulator game with robux weapons you can buy. You load into the game and you get to choose from 2 starter weapons, after thta you go out and kill zombies for zombie body parts you can sell them and get money to buy better weapons like axe pistol or something. then you get to new world with new and better wepons, armor and zombies and when your gonna buy a new world you need to deafeat a boss first. You can also buy armor so you dont die!