But it was recently resolved and I've been having good success with the OSX build, it's running really smooth and should be ready soon (maybe in a few days after more play-testing!)...
Here it is, on my 2012 Mac Air (El Capitan):
Update 27/10/2016: It's ready, everything functions with the exception for Steam SDK/DRM integration as there's still a minor engine bug that causes issues on OSX Steam. So no achievements & overlay, but everything else works just fine!
Note that achievements are tracked in-game (in a handy achievement menu) and when the engine issue is resolved, I'll update to add those features which will unlock retro-actively based on your progress.
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Progress on the next game, Nuclear Nomad, is going well, the world map AI is very dynamic and everything is linked to the economy & logistics. However, I'm still working with place-holder art so it's not ready for a public showing yet.
Because it's still early days, it's the best time to design and implement features, so if you think you'll enjoy a highly dynamic post-apocalyptic sandbox inspired by Mad Max + Mount & Blade, head on over to the thread here:
http://steamcommunity.com/app/414950/discussions/0/412449508273575863/
I welcome all suggestions and ideas and very open for discussion and feedback.