I am happy to let you know that after 3 long years we have successfully developed and released our 2 games, Steel Storm: Episode 1 and Steel Storm: Burning Retribution.
Blender and GIMP were our exclusive art tools during the course of the development (no, we didn’t use BGE as our game engine).
Steel Storm: Burning Retribution is available at the game’s website (http://www.steel-storm.com), in Ubuntu Software Center, on Desura and on Steam.
Enjoy!