Just got back to the US of A and rebuilt the Mac version. It should now match the Windows version.
This update was a handful of tweaks. See the details here: http://steamcommunity.com/gid/103582791436383774/announcements/detail/201865556441358034
I tested the build before I pushed it, but I'm admittedly very tired so please poke around & let me know if I actually broke anything while making this build! ^_^