Hhmm, I tried to play but it told me that I don't have a current version of Silverlight. I was given an option to install the latest version, but when I followed that link, I saw this message:

I did not click the "Let us know" link to report it, because I thought I should let you know first.
My version is 4.1.10111.0. It may or may not be current. (I don't have automatic updates enabled, but instead, automatice download, and let me decide when to install. I might have gotten an update recently but declined to install at that time.) But the message on the Silverlight page says I was trying to get an earlier (beta) version.
Looking forward to trying it out

Edit
I found the current version and am downloading now. I should be able to try the game shortly
