Verry nice composition and balance. I enjoyed listening to it.
Stop waiting/checking for sales and keep writing and uploading.
Check this one out:http://audiojungle.net/item/mercurial-nostalgia/4976457
Check this one out:http://audiojungle.net/item/innocence-of-the-first-sin/4238156
I think build or release means that a song builds up, it has an intro, and as the song continues you enter the song’s ambient, atmosphere, and a tension begins building up. Most songs have a tension, and a maximum tension point. And everything builds up arround the tension. When the maximum tension point is reached there is an explosion that releases the tension, leading toward the end of the song. On most songs the tension builds up through the introduction and verse and reaches maximum tension and explosion on the chorus part.