Just allow API use, and you can use it in Geometry Dash. It's OK if you don't.
Reviews for "Neptune"
I’m pretty sure this would be usable in gd, unless not
Great Music Dude!
This is really good! I asked Robtop to approve your music in GD. Apparently he takes a long time to respond. I'll let you know what he says :)
Nice song, man!