A post on X from DRAGAMI GAMES expresses the developer's deep gratitude for the response to Killer is Dead, which has now surpassed one million lifetime sales (thanks Gematsu). But in an extreme example of a long tail, this success spans more than a decade, as the stylized action game was released on consoles in 2013 and on Steam the following year. Here's word:
“Killer is Dead” has surpassed 1 million copies sold worldwide! We are deeply grateful for all your support—thank you from the bottom of our hearts!