X-Plores is just such a great game. Its a little over shadowed by 'Stars Without Number' and a minor quibble is its not exactly a retro-clone of the original game. Its a super great game and certainly a great retro-sci-fi of 60's-70's sci-fi.
And the new cover really captures this. There is an old time Aussie author Bertram Chandler who I read as a young-takka whos sci fi really captures this feel go see if you can find some of this books for some really great reads.