Which, theoretically, means that it can be played on any OS. But has anyone given it a whirl on Chromium? I am... shall we say, hoping that no, this is not the case.
The last thing I need to be doing on my brand spanking new cloudbook later this year is, well. Playing Spiral Knights when I should be working, instead. =P
I think you will find this is a limitation of Chromium OS. From what I've seen it supports Java scripting and such but something that requires a Java Virtual Machine for a GUI is a no-go.