Version 2.500 brings official linux support to both the game and its expansion for the first time, as well as a 64bit OSX build. There are also a couple of bugfixes in here, as well.
Not only that, but there is now a "complete edition" that includes both the game and the expansion for $6.99. In celebration of the linux launch, all of the Skyward SKUs are 75% off for the next 10 days!
Enjoy!