Game Dissapeared

It seems like my game has gone completely blank. Has this happened to someone before? Is there a way to reverse it? I didn’t delete anything, it just seems like it went blank.

http://flowlab.io/game/play/380296

It looks to me like only the first level “start” is blank. The second level, “level 1” has stuff in it. Do you just have it starting on the wrong level?