Hey, I have/had the same problem and solved it same way you show here. But now I run into the next problem, that nodes and presets (everything .lua-related?) can't be loaded. Does any other mac-user experience the same? MacOS Sierra 10.12.5, Tilemancer 0.2.1 (3).
I also looked at this thread, but this does not to be the issue here...
https://itch.io/t/19845/ui-issue-on-osx