Though it's a little resource-intensive, the Windows version runs on Linux via Wine. I have it running, complete with sound, on Ubuntu. Just a heads-up for anyone who may have questions as to whether or not it will work on Linux. I figured I'd take the chance. Even if it didn't run, it was worth the $1.99 plus the extra $10 donation for the Rusty Lake games, without a shadow of a doubt.
Comments don't appear to yet be enabled for Roots, but it, too, works great via Wine on Linux (once again, tested on Ubuntu), and with no noticeable resource intensity except for (trying not to give anything away) the initial scene with Rose, with the object that needs to be dragged, when graphics are set to high quality. So in case anyone is reading through reviews on Rusty Lake's work and is interested in Roots, rest assured that it is another spectacular piece of work. In fact, so epic that I played it through twice, including all extra features, in as many days --- and good enough that I'll play through it again in the future, just like all previous installments.