Besides BGM and credits, you could simply just put it on loop and chill to it you know. =)
It can be used as menu music and in my opinion credits music to, it has a nice jazzy beat to it I am tapping my foot right now very catchy.
You should sell this song or play around with it then sell it, its really good.
I could also hear this as a full length song with vocals. Enchanting. Like the ghostly sound to the melody. Very nice.
Please contact me if you would like to use this in a project. We can discuss the details.