I've uploaded a Linux version of Runner to the ADRIFT website. This makes use of the Mono Framework.
The software is still pretty buggy, especially the Mono version which is not 100% compatible with Windows, but it should be possible to run games reasonably well.
I'm obviously new at creating Linux distributions, so if anyone has any suggestions of improvements, please let me know.
I also introduced a couple of major bugs in 5.0.18, so I have fixed these, and the versions on the website are now 18.104.22.168.