Update 1.3 is now on the testing branch, for anyone who wants to help test it! This update will add bonus remixed levels, a mirror mode ("Nilbog mode") and several bug fixes.
To access the testing branch, right click on the game in your Steam library, click "properties," then "betas" and select the "testing" branch.
For a full list of changes, consult "changelog.txt" in the Chop Goblins install folder.