It has been frequently cited in video games literature as an interesting and moving use of permadeath mechanic (permanent death).

The player is given six days to create an antidote, after which point one of several endings may be achieved depending on the choices made.

WhatGamesAre describes the gameplay as that of "a simple adventure game where you can walk around, talk to people and open doors.

"[1] There are multiple endings, and some reviewers asked readers to share their own personal experiences on how they chose to spend their last 6 days on Earth before the ceasing of all life.

"[5] Alternatively, Destructoid spoke positively of inability to replay, stating, "There's a problem with branching paths and moral decisions in videogames: even if they are meaningful (few are), players can usually bypass the system by using multiple save files or other means to go in for another attempt and a different outcome", adding that the game had a very good system to prevent people from "cheating".