Comments/Ratings for a Single Item

Mercury is a slightly odd choice for a game using a satellite board, as Mercury has no satellite. Also, Mercury is similar in size to Jupiter's moons, after which you name large variants! A better reference might be Pluto, an even smaller world and the only one with a moon as much as half its own radius (and so an eighth its volume and mass). That apart your use and spreading of astronomical ideas is commendable. I have urged Hans Bodlaender to include in his page on the Gnu reference to your games that use it.