Official specs from Steam

Omori system requirements

Minimum and recommended PC specs as listed by the developer on Steam. Native macOS version available.

Minimum

Note	Requires a 64-bit processor and operating system
OS *	Microsoft Windows 8.1 (32bit/64bit)
Processor	Intel N4100 (or similar) or better
Memory	4 GB RAM
Graphics	DirectX 9/OpenGL 4.1 capable GPU
DirectX	Version 9.0c
Storage	2 GB available space
Additional Notes	1280x720 display is recommended at x2 resolution but is not required

Note	Requires a 64-bit processor and operating system
OS	Microsoft Windows 10 (32bit/64bit)
Processor	Intel Core i3-6100 or better
Memory	8 GB RAM
Graphics	OpenGL ES 2.0 hardware driver support required for WebGL acceleration
DirectX	Version 9.0
Storage	2 GB available space
Additional Notes	1280x720 display is recommended at x2 resolution but is not required

OS	MacOS 10.12 (Sierra)
Processor	Intel N4100 (or similar) or better
Memory	4 GB RAM
Graphics	DirectX 9/OpenGL 4.1 capable GPU
Storage	2 GB available space
Additional Notes	1280x720 display is required to play the game at 2x resolution

OS	MacOS 10.15 (Catalina)
Processor	Intel Core i3-6100 or better
Memory	8 GB RAM
Graphics	OpenGL ES 2.0 hardware driver support required for WebGL acceleration
Storage	2 GB available space
Additional Notes	1280x720 display is required to play the game at 2x resolution

What graphics card do I need for Omori?

Minimum: DirectX 9/OpenGL 4.1 capable GPU. Recommended: OpenGL ES 2.0 hardware driver support required for WebGL acceleration.

How much RAM does Omori need?

Omori needs 4 GB RAM at minimum, 8 GB RAM recommended.

How big is Omori?

Omori requires 2 GB available space.

Does Omori run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. There is no native Linux build (Proton compatibility may vary).