Grand Theft Cygnus - enhanced version

This game began life as an entry into a BASIC ascii 10-liner comp. The  original basic version is here.  I liked the idea and decided to work on the game without the constraints of the competition. It's now written in assembly, I added custom graphics, music (Le Cygne by Saint Saens, obviously), enhanced the 'distance' calculation, added a graphic 'lose' screen and a 'win' routine (which will be v…