Saving and loading works now, there's example -directory you can try it on. I haven't put the layers in the repository, because they are currently very large files, 16MB per layer. I will alleviate this in the future. Just draw something, then press 's' and you'll get such saved layer.

Notice you need a .plat.cfg to your home directory. Just copy the end of this file and fill it accordingly.

[plat] data_path=/path/to/data/directory/