2560x1440 Steam Workshop::Audio Visualizers> 1412x790 Best Audio Responsive> 1280x720 Wallpaper engine - Audio.
(But your video marketing is spot on: straight to the point, eye catching imagery in the first 6 seconds, and music for those that decide to watch, not that you could have really done this without music, but still. 2560x1440 Steam Workshop::Audio Visualizers. No point in having this get pushed down in the feed over a bit of marketing.
In it's current state, I would say it is good, but someone with skill in scripting Wallpaper Engine could recreate this in the editor and with a much smaller file size so I think calling it one of the best is risking downvotes for really no reason since most people look at the image/video first and only read the title if that catches their eye, which this video does well. I also do think that titling this 'one of the best' in inviting trouble for yourself because there is some pretty stiff competition in the audio visualizer realm, especially as far as application based wallpapers go. With more user control and less scaring away first time subscribers, I think this would be pretty nice! It's pretty cool! Like most people are saying, I think it could use some sliders to let us tone it down and I would honestly recommend turning down the defaults because that was way too intense for my liking and I immediately tabbed off of my desktop to disable it.