The First Day is a survival horror game about the start of a zombie apocalypse. Rather than place the player into the post-cataclysm world typically taken by zombie survival games, instead the player must learn to navigate the initial realizations and ensuing panic of the population at large within the ground zero of such an event. With a realistic modelling of a patient zero and spread of infection, the player will have approximately the course of a day to manage to gather supplies, allies, and make their escape from a city rapidly being consumed by the infected. In this situation however, panic and mass hysteria will spread as fast, if not faster than the infection, potentially turning other survivors into deadlier enemies than the plague itself, meaning that the player will also have to figure out how to avoid as many people as possible while also recruiting help, as no-one can expect to survive a zombie apocalypse alone.

Themes:
Survival Horror
Realistic Basis and spread, Game will end on escape from the city or on player death.

Platforms:
Pc would be the best platform, with technological restrictions being less pervasive allowing for a more open world and larger scale city to navigate. This would also facilitate multiplayer well.

Target Audience:
With a Third/First Person perspective, and an action/horror/survival theme, The First Day will cater to an audience of people who like to immerse themselves within similar environments. It would be aimed at players of similar games such as DayZ and Unturned.

Reference:

http://blogs-images.forbes.com/erikkain/files/2016/02/Amazon-Zombies-1200x801.jpg