There were many really nice demos on Revision this year. Hacker News favorite (and mine, too!) LFT put out another microcontroller demo, Sum Ergo Demonstro:

https://youtube.com/watch?v=v8zKDotYh9A&is=xAbW7VZVGLn0986B

But I think my favorite so far from the ones I've seen has to be Second Nature, an OCS Amiga demo by Desire & The Twitch Elite, and music by Hoffman.