Oh, hey, the music in Jump Car (2:15 in the video) is from Shenzhen Nanjing's Golden Sun and Shui Hu Shen Shou ports. (Which is, in turn, a cover of a tune from Majin Eiyuuden Wataru Gaiden, but the instrumentation in the original game is different.)
Still wondering exactly what the connection between Nanjing and Jungle was, because there was obviously something going on...
Edited to add: Yep, definitely sensing a Nanjing connection in there somewhere. The off-key version of the Zelda dungeon theme heard in Space Castle also shows up in some of Nanjing's older RPGs.