This version comes with some bugfixes:

-Sync issues with Steam client fixed

-Issues with some achievements fixed: Serial Killer, Rookie Pilot, Seasoned Pilot, Veteran Pilot, Butterfly Collector, Butterfly Menace and Butterfly Terrorizer.

This version comes with some bugfixes and improvements:

-Improved loading times on Mac version

-Minor tweaks on plane movement

-Fix for issues on plane particles when restarting a level

-Fix for visual bug on colored enemies when receiving impacts

-Steamworks updated to version 1.38

This new version comes with some improvements:

-Increased quality of some textures
-Increased quality of sound effects and music
-Fixed some bugs with steam overlay