So we hope we have a new Mac version of Duskers that will run on the newer and older OS's. Would love if our Mac players could give it a try. I just pushed it to the "future" branch on Steam. Just go to Duskers, right click (two finger or control-click) and select properties -> Betas, then choose "future" from the dropdown. You should see the game re-download/update. Then just try to play :)

If it doesn't work, please try to exit Steam and restart to make sure you're not getting the old "future" branch. Would love to hear if you're now (or if on an older OS - still) able to get your Dusking on :)
...or not :(