Firmware Overview - microsoft/ExpressivePixels GitHub Wiki
Expressive Pixels has been designed so that it can run on a wide variety of firmware, there are many ways to integrate it into your designs.
If you only want to run animations with raw binary animations exported from the Expressive Pixels App, you can leverage the classes just for decoding the animation and rendering with the Minimal classes. See the Minimal code examples.
For the fuller fledged firmware which enables activation/storage/control communication over USB or Bluetooth see the other code examples.