Unsurprisingly, these are incredible. There is something magical about small, beautiful things. It's not profound to say it, but I find it hard to tire of the fact that you could package up all of the demoscene, 64k, code golf, and JS contest entries like these (and maybe throw in a copy of Project Gutenberg and Wikipedia for good measure) on an SD card and balance a lifetime's worth of treasure on the tip of your finger. A single board computer to run (or emulate) all of it could then go in the palm of your hand. What a time to be alive!
Amazing work, congrats everyone! The unminified source code for all of these games is on GitHub for those interested in how this black magic is done.