Huh... That's weird. As of version 1.3.1, I changed all builds to be 64-bit.
When you say "looks like it's compiled in 32-bit", is that based on some analysis of the actual build files, or looking at the file name, or something else? I don't have a Mac to test on so I can't verify it myself, but I was fairly sure I'd built for 64-bit. I can make a new build to test if you like.