Unfortunately Moonlight, the version of Silverlight for Linux developed by the renowned Miguel de Icaza (also founder of the GNOME project) has been shelved,
as the FAQ clearly states.
I'm a Linux user too (2 years here though). Sucks, but this game was developed in 2008 when HTML5 was a piece of crap with bugger all documentation available for it.
But you know what? Apparently it works under
WINE, through Firefox.
I'll try it tonight or tomorrow and post results, don't give up hope just yet, Linux is still an outstanding operating system, even if it doesn't have Afterwind.
Also, I prefer KDE myself, you should totally try Kubuntu dude. Best KDE distribution ever.