Now this is a very original game! What a great concept and use of the gear animation to be the thing that interacts with the level itself! Very high marks from me. Would have liked at least a music track to really hit home!
You can grab bgm from the asset store btw. It's not as intiuative as images but you can access them by "play a music /sound"->"chose the audio to use"->"Chose from asset store".