We have taken the difficult decision to withdraw support for Linux at this time for the following reasons:
Linux requires a large amount of specialised graphics programming as it uses OpenGL as opposed to DirectX on Windows.
As driver support for Linux is not as comprehensive as for Windows and Mac, we would be required to make a number of adaptations to graphical shaders for them to work correctly.
In order to release on Linux we have to build and test many different distributions, each with their own set of complications and adaptations required. As of this time we do not have the studio resources to adequately create and test all of these.
We also have other issues such as complications with input devices, especially game controllers along with some Linux specific Unity bugs, such as not being able to correctly render the video player.
We would still like to support Linux and we will re-evaluate the possibility of a Linux release in the future.
If you pre-ordered Phoenix Point for Linux, please email firstname.lastname@example.org so that we may assist you.