Today I released the Rabenstein C64 40th Anniversary Edition, which is a point and click version of the game that moves away from the parser driven approach of the original release. You can play it with a mouse or joystick and it features wonderful moody SID tunes by one of the greatest artists in the scene.
This special version is available in both English and German language. A physical / boxed release on cartridge and disk may now be preordered from my publisher PolyPlay.
The game was designed with the limitations of a classic 80s computer system in mind as it is intended to run on real hardware. The parser and all the game text needed to reside in memory while playing so yes, it certainly might be clunky in places.
Regarding your in-game situation, have you investigated the ground where the coachman disappeared? You may find something that helps you on the graveyard.