It would be better if you added some instructions to go with it, like how exactly do you do it? What are the controls, and how do you add the next layers, effects and so on. then it would be more helpful to people like me who don't know how to use that type of paint program. it looks cool though.
This looks amazing!!! However, you need to add text to these if you are going to call them tutorials. Just a simple explanation as to why we need to do this or that would be fine. I would also recommend speed painting videos. You could combine the two and make one hell of a tutorial!!!
Also, personally, I would have added a nebulae or planet or something that wold make it look more space like. Although, this does give it the sort of space-time ripping to shreds sci-fi feeling to it.