There's a new Linux-friendly game launching today that's powered by the demanding Unigine Game Engine.
Sumoman is an adventure puzzle platformer game. With its usage of Unigine, the graphics appear rather interesting and there is also advanced physics support.
This is a bit troublesome, the developers of Ticket to Ride have decided to abandon Linux support with no announcement.
They have removed the SteamOS icon from their Steam store page, but they haven't removed the game from your collections. The problem is that a few people have completely lost access to the game and it doesn't seem like the developer has made any attempts to fix this.