Notch made another game, and it only took him a week. It’s called Shambles, and it’s about that time honoured favourite, zombies.
The main goal of the game is to not die for as long as possible, and to increase your score by killing zombies and picking up the yellow globes they drop. This is complicated by the panicked civilians running around; they join the ranks of the living dead if they come into contact with a zombie, or you can kill them for health. Then there are soldiers who shoot at the zombies, but can be killed for their guns (of course, they fight back). It’s a big old mess, but a lot of fun.