Man this is what I'm talking about in my journals,... something new/innovative. It would has been great to get some information from your side about the picture and its story. On the other side this allows the viewer to find his own ideas/words. For me, this looks like a parallel-universe thing what is really cool.

I only would recommend to use more detailed textures for the planets. That would improve the impact (because the bottom left planet is a real eye-catcher). The other things are the nebulae and the gates. The transitions could be better. It still looks kinda unreal. The problem is: I can't really tell you what to change there :/ Maybe try not only to use the twirl filter but also some more pure brushwork. The last point are the textures in the top right corner. I would suggest to soften them a bit. They are too obvious in my point of view.

But like I told in the beginning: Besides the mentioned points, I really love it! Keep it up!