There are many buildings, rooms, and NPCs to explore. Some items can be gained by breaking the WATERMELONS that are in each location. Various helpful items are spread throughout the world. Areas can 'loop' into each other, making the two-dimensional OMORI-verse feel uniquely three-dimensional. The player controls a party of four characters who travel through the game's colorful two-dimensional world with no accessible overworld map.

OMORI features many traditional RPG elements but contains a very unique battle system. While OMORI has already been released, any future updates for the game will be posted to the OMORI GAME official website or any listed social media. The overworld and its characters are represented with pixel art while enemy battles, images of items, and important cut scenes are represented with hand-drawn illustrations. The art direction combines pixel art with hand-drawn art.

OMORI is heavily inspired by the Mother series, specifically EarthBound and Mother 3, as well as Yume Nikki, another independent horror RPGMaker game. He also seems to have forgotten something. He wonders why his friends would want to be with someone horrible like him, but OMORI recalls a time when he was not like this. 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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