Final results!
32x16 resolution, 4 FPS, 500 bits/second AV1 coded. Final size: 1.35 megabytes.
Here's the hotlinked version on tumblr, to avoid wasting mastodon bandwidth with stupid:
https://64.media.tumblr.com/041fd5718b2ad8b0161238e84953d6d1/07231cc43dba6cf9-27/s400x600/2125574b83190218c5539dc5838dde1b863b6bd9.gif