This small update fixes the bug that prevented the "Welkin Road" achievement (that you receive for completing all levels) to be updated. When first running this version of the game it will check your progress, and update the achievement retroactively. If you previously completed all levels, running this build should unlock the achievement on Steam.
Changelog:
To give you an update on what's going on with Welkin Road at the moment, I'm working on a rather big update and I'll be able to share more details soon!