Besides the images, there is no additional information about the game. It is likely one of Valve’s experimental games that never saw the light of day and is unlikely to ever be released. Rumors emerged in 2012, and it was definitively confirmed that Stars of Blood was in development, but no further information was provided. This is yet another project that ended up in the dustbin of history.
The drawings discovered on the internet depict various locations, including a city of the future with massive buildings and a desert with stone structures. In some places, one can spot similarities to Night City from Cyberpunk 2077.
The concept art looks impressive, but it is hard to imagine that such vast spaces could have been created in a game back in those years.