Just recently Klei Entertainment (Don't Starve, Oxygen Not Included) released their amusing parkour game Hot Lava and it's not only planned for Linux they're actually working on it.
It looks and sounds like a ridiculous amount of fun too, a 3D platformer inspired by the classic kids game. I'm sure everyone has played it at some point in their lives. Get a bunch of pillows and cushions, throw them around and don't touch the floor! Klei managed to turn that into a pretty good looking game PC game.
Take a look at the trailer:
When asked on Twitter about Linux support, they said "Yes! It will come in a future update. Don't have an exact ETA but Linux is in the works." so that's great news!
Klei's Linux versions are usually great, so I'm excited.
You can wishlist and follow it on Steam.