I never had a C64, so I went to a friend who owned one whenever I could to play this game. I think he hated me for it.
The C64 soundtrack is so incredibly relaxing ... It's just the main theme played on a loop, but rythm and instruments make one humm along and forget about time.
The gameplay for catching ghosts is quite simple, what makes this game challenging is managing the budget and making sure the PK energy level in the city won't rise too fast.
If you earn enough, you can buy improvemetns for your car to catch more ghosts while driving to your destination, keeping the level down this way.
Funny nerd moment: The traps in this game are closer to the original script than the ones in the movie. Originally a ghost trap would have the size of a Soda vending machine and it required two people to carry. However, in the original script it would not "grab" the ghost. Instead one person would open the lid, another one would guide the ghost inside, only then they would close the lid. But I think we all agree that the version in the movie had a higher entertainment factor and it was also used for this game.
There is a unofficial Windows version of this game, remade from scratch, but sadly it doesn't use the original C64 music and it's also quite buggy.