I don't mean to pressure or anything, just wanted to let you know that I'm another voice interested in a native build. My experience with Unity games is that Linux builds are usually functional from first attempt (unless you rely on low level calls for platform exclusive features like DirectX/Metal or external binaries)
Also you have the same Steam link in the "more information" tab twice.
Ok, so, no surprize at all here, the game requires OpenGL 3.2 at least. You may want to put this as a minimum requirement.
Works rather well with software rendering on a mobile 1st gen i5 though, apart from occasional hang-ups and fps drops in menu, as well as when rendering shadows or many sprites.
Testing will continue when I get to my actual computer.