Modification unneeded in 1.4.0.0. #5
Description
https://celeste.ink/wiki/Version_history version 1.4.0.0 says this:
Updated to the latest version of FNA, introducing FNA3D. This means the FNA version can run DirectX on Windows and Metal on Mac
And game works out-of-the-box on M1 (MacBook Pro 13-inch, M1, 2020, binary Kind=Intel) without modification, installed from Steam.