Version 1.0.3.142 has been released on Steam for Windows, to include the Fall Patch. This means cross platform play will not be possible until the Mac version is updated.
I'll update the first post ASAP.
Version 1.0.3.142 has been released on Steam for Mac, to include the Fall Patch. This means cross platform play is now possible.
The AppStore version is still at an old version - 1.0.3.18, and is not save or play-compatible with the current Steam versions.
The first post has been updated.