CC-BY-SA 3.0
Viewing post in GML Neural Network Tutorial comments
Why not 4.0?
All the CC licenses are compatible with later versions of itself so you should add the license into metadata for the asset pack(s):
"Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your music
You also have code... So what license does it have? MIT? The metadata for code license in the same place...