I agree with Havk about the light percussion.
I personally dont think it would change the mood too much- but give it MORE. Depends on how exactly you did the percussion. Light drumming beat would make it move more- give it more FLOW. When i listened to it- i felt like i was expecting a light beat to make it flow more and make it more exciting and add to the whole effect- help along that awesome little tune youve got - although maybe thats not what you want?