@jk It's mostly blender, but the textures for the planet and nebulae and "debris ring" around the planet are all hand-made with aseprite =>

To get the low res look I just rendered at 20% of 1080p and then upscaled with imagemagick, then shoved all the frames together with ffmpeg (I couldn't get ffmpeg's built in upscaling to avoid interpolation!)

To get the sorta "concentric circles" of light I used a custom node group, which is also responsible for the shadows being ever so slightly colorful.

If you're interested I've already uploaded the .blend for the r/blender contest so you could take a look if you'd like! http://pasteall.org/blend/index.php?id=47831