NeoAnim is a way to encode NeoPixel animation into bitmaps. It's a surprisingly easy way to design cool animation (once you wrap your head around the concept).
- open the converter https://microsoft.github.io/pxt-neoanim/index
- paste your image
- open https://makecode.adafruit.com
- add the neoanim package (go to Advanced -> Add Package)
- copy/paste the generated code into MakeCode and run!
The image below is an example of possible animation and the editor shows the animation once converted.