Finally! I had planned since I started this project to support all of Windows/Mac/Linux, but I've had a variety of struggles getting the Mac/Linux versions to work properly. Recently, the Construct 3 engine has introduced new tools to export modern builds to each OS separately, so I've given these a try and they appear to work.
Steam Cloud should work as expected, so your saves can carry over seamlessly between multiple PCs on different operating systems.
And yes, macOS support is still on the table. I plan to get that added eventually.
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