I saw this tweet by Polyducks and felt inspired/compelled to make something like it in PICO-8:
https://twitter.com/Polyducks/status/1082764062998581248
:>
EDIT 2019-05-18: added new version with refined color palette and adjustable speed (using left/right), moved out of WIP
EDIT 2019-06-13: decided I was not quite done with this :p, refined color palette again, adjusted muncher movement, added ability to add/remove munchers, switched to 60 FPS
This is like a screensaver that you can just watch, but it also has some controls: