Another PICO-8 doodle for Octobit 2017. It is very much based on my previous butterfly doodle at https://www.lexaloffle.com/bbs/?pid=45347#p45346
The fish are inspired by neon tetra fish.
I drew the animation in Pixaki on my iPad and then imported the sprite sheet into PICO-8. It uses palette swapping to draw multiple colors of butterflies.