The only place I know where some Linux system requirements are given, is
Steam. There it says "Ubuntu 12.04 or later". Ubuntu 12.04 also is the one distribution mentioned in the
Alpha 10 changelog, besides Debian, where it is reported not to run due to missing glibc 2.15 library. However, there they said "The game should work fine on other distros, but please let us know if you have problems.", and in the
Linux section of the wiki, also Debian is included in the list of distributions wher the game is running fine (besides Ubuntu, Linux Mint and Arch Linux).