This is a small GameBoy Color demo program based on Lachlan Cartland's (@AlcopopStar) pixel art piece "Beach":

It was posted on Reddit: https://www.reddit.com/r/PixelArt/comments/7kqqjm/oc_beach_4_colours/

First of all, download the original gif:

wget https://i.redd.it/w49wc60kys401.gif

Explode the gif into its individual frames:

mkdir frames
(cd frames; gifsicle --explode --unoptimize --use-colormap colormap ../w49wc60kys401.gif)

You will also need to clone and build rgbds.

Run the Python script autotile.py which reads the individual frames of the animation and tries to make the animation fit into the GameBoy Color's tile banks (512 tiles for background maps):

python autotile.py

Run the build script that assembles and links the final ROM image:

bash make.sh