I just found this problem when I saw the message you posted, it's my first time using itch.io, I didn't notice this, I'm really sorry.
As for the shader issue, I didn't notice before development that the result of rust-gpu build needs vulkan compatibility layer, in fact, not only macos, including wasm version also can't work properly, I will consider this issue in next development.
Thank you for your comments, compatibility issues will be a priority for me in the next game jam.