Theres instructions for building a native macOS version on gitHub that seems to work really well for Apple Silicon (and my intel macbook pro): https://github.com/ExOK/Celeste64/issues/22
You just need to install the .net 8 sdk before trying to run it.
edit: nevermind, theres a macos build on github now too: https://github.com/ExOK/Celeste64/releases