does anyone know the developers of this game? https://web.archive.org/web/20111228123816/http://holyspirit.fr:80/ (it's an old dead game)
I would like to release their graphics, sounds and music on this site, but I do not know if it's all (really) under the GNU General Public License version 3.0 (GPLv3) as it is written on sourceforge https://sourceforge.net/projects/lechemindeladam/

I tried to contact Gregouar, one of the developers, via email, but I have not yet been answered

an old interview says that the graphics were made by the game developers:
Gregouar, Bravach and Killpatate