Developer posts and news about this game.
In some cases, lifetime score achievements weren't correctly being triggered. That should be fixed now. Reduced requirements for unlockable ships and powerups. You may see a bunch of new things unlocked.
v1.04 Changed the location of Steamwork libraries and added a check at the launch of the game to retry getting all achievements in case any where mixed.
Posted a quick update to the enemy follower logic to make them more fun and less frustrating. See the new behavior here. Thanks to Beefenstein for the feedback!