Generate a first person shooter game using three.js where the user is roaming around a field and fighting potatoe zombies. The potatoe zombies should look as real as possible to potatoes in shape, but have scary block faces like zombies. The user should be able to walk around using the arrow keys or keys that are on the screen for mobile, and there is a 44 magnum that the shooter is holding out in front of him. There should be a shoot button on mobile or space for desktop. When the shooter hits a zombie potatoe it should blow up
