Thanks for your feedback, we just released a Linux build. Let us know how it runs for you!
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.