How do I apply the patch?
Make sure you have Steam installed, and OMORI is downloaded within Steam. Launch the game at least once after downloading it. It'll probably crash but that's okay.
Download the latest version of the patch script (omori-apple-silicon-patch.command) from the releases page.
Within Finder, control+click the patch script and choose Open to execute it. A terminal should pop up with progress information.
Once the process has finished, indicated by Done! in the output and [Process completed] at the bottom of the terminal, quit terminal and launch OMORI through Steam.
If MacOS complains about the security of the file, or it's "not executable", open a Terminal within the enclosing folder of the script and execute chmod +x ./omori-apple-silicon-patch.command. After that, try running the patch again.