Level Editor update is now live on Steam! You can build your own adventures and upload them to the Workshop for others to play! Update 1.2.0 also brings also 3 new achievements for you to unlock.
Level Editor Guide
Check out the guide we prepared for you to get started with the Level Editor.
http://steamcommunity.com/sharedfiles/filedetails/?id=514780252
Forum Discussion
http://steamcommunity.com/app/252550/discussions/0/523897277926088833/