nice color use and good work my friend. I would say compositionally though, the asteroid (that's what they are?) in the bottom left corner doesn't do anything for the image, and it would look better without it. (I just put my finger on the screen to try that out if you're wondering)
And the black movie bar at the bottom I think (personally) should be thinner. But then again, it does help to direct your attention to the destroyed planet (or that could be because you've nicely placed the phrase at the bottom, which helps the viewer look parallel to the focal point).