I've been reading over their site, and I can't tell if all parts are open sourced, or if they have some of their own closed source stuff on top.

If the client is open sourced, or at least the installer works in debian and you can fulfill all the dependencies, then it should be doable... You might have to manually move **** out of rootfs after install, and symlink, but shouldn't be horribly impossible.

That said, I'm not interested enough in games to make it happen. (If I knew what I was doing more, I'd try to see if I could get it working, but I don't feel skilled enough to think that I could get it working without spending major effort on trying.)