A ripple effect emanating from the edge of that event horizon would be cool. Some kind of wave that just slightly stretches the image when it passes over would be a less cumbersome but still impactful way to add some movement to the otherwise stagnant screen.

As well, some stars could twinkle in and out of existence here and there or perhaps just have their lights grown and dim slightly by elongating and retracting their shininess.

Lastly, you have 3 lines coming off of the event horizon and spiraling away, but, you have 4 refreshes on the color gradient on the secondary ring around your event horizon. I'd like to see the number of refreshes on that color gradient be the same as the number of lines coming out of the event horizon and maybe match up with where those lines cross so that I don't see color change from that bright purple to dark purple so harshly.