For those of you after some fresh games, The Humble Dystopian Bundle is out and it includes a couple good Linux titles.
For the PWYW (Pay what you want) tier you will get Beholder and Orwell: Keeping an Eye On You. If you pay more than the current average then Orwell: Ignorance is Strength is yours.
And finally, if you pay for the top tier you will get >observer_ which is a personal favourite of mine. Great graphics, a story that kept me truly on edge and it really did leave a lasting impression.
Check out the The Humble Dystopian Bundle here.
That might not seem like a lot of titles, however, there's a few titles included that aren't on Linux. These are Tokyo 42, Distrust, Rain World and 60 Seconds! (which has a Linux beta).
All of those work in Steam Play, although not all to a "Platinum" level.