We've had a lot of feedback from people asking to create their own levels, so I've decided as a quick "fix" for this is to let people create them externally in Blender.
A level creator is still planned for the future, but for dedicated users, you now have the option to make your own.
I've created a guide that should be easy enough to follow and create something simple. If you're up for the challenge, make sure to read the guide carefully and see what you can create!
http://steamcommunity.com/sharedfiles/filedetails/?id=1247141752