Superb demos this year at Revision. Triplet by Otomata Labs for the Atari 2600 is exceptional

Original release video (probably running on Stella)

https://www.youtube.com/watch?v=aEJ0A8Wvdxs

And a video of it running on Gopher2600.

https://www.youtube.com/watch?v=ixFH22MxqEg