The game focuses on OMORI, a depressed young boy, going on adventures with his friends and helping others in the world. The game is based around several previous works by OMOCAT, including OMORI'S BLOG, OMORI'S STORY, OMORI's SKETCHBOOK, and an unfinished graphic novel. A Nintendo 3DS port stretch goal for the game was funded, but it was later announced at PLAYISM's pre-Tokyo Game Show 2019 that this port was cancelled and replaced by a Nintendo Switch port. The game was successfully funded on Jvia Kickstarter. The 2020 trailer music was written by bansheebeat (Dylan Browne) and composed by Pedro Silva. It is directed, written, and illustrated independently by OMOCAT and her TEAM, including music by SLIME GIRLS and CLOVER & SEALIFE.

The Nintendo Switch and Xbox One port released on Jand the Playstation 4 released on June 24, 2022, while the Japanese port for PC and macOS released on December 16, 2021. OMORI is a surreal psychological horror RPG Maker game developed by OMOCAT and co-published by PLAYISM which fully released for PC Windows and macOS on December 25, 2020.

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