Omori is an indie role-playing game developed by Omocat and released in 2020 after a long development period, following a boy named Sunny and his dream alter ego Omori through the world of Headspace. Music plays a central role in the game, shifting between playful exploration themes and quiet piano pieces for its more emotional moments. Clips named for oyasumi, the Japanese word for good night, circulated among fans on video and soundboard pages, where the melody became shorthand for sleep, farewells and the game's bittersweet ending mood.