Ah ok - I am not up to speed with Mac Oses!
The build should work for either 32 or 64bit Mac OS, so that warning on Steam maybe is just in case?
Anyway thanks for testing
the build does work and the game is... ooh i think we have something special here. Still though, pretty weird that Steam doesn't think it will, I wish I could help more.
On an unrelated note, would there happen to be a FOV setting that I may have not noticed or if there isnt do you have any plans to implement one in the future? personally i would like just a slightly wider one than at least the default and I know the desired FOV can be different for each person? either way, im very pleased to say that on my slightly out of date and heavily abused MacBook Air (too many 4x games make battery go fat), with only a tiny bit of fiddling in the graphics settings, it was able to run very smoothly, though when I lowered the resolution (not necessary for it to be smooth, though other games it often is so I tested that), the selection boxes were weird and glitchey, like the little box of light around an option when the mouse is over it, they looked slightly fragmented with the resolution just one thing lower than the default and that was not there for the default. Could be a cool effect but I assume it isnt intentional considering it is inconsistent between resolutions. Good luck, and I am looking forwards to the full game!