Hi Marco, I've played some of your little ports (Cloak of Darkness and Accuse) and saw your blog. I've read you have a taste for text adventures so you might be interested in one of my own PC games: https://ededo.itch.io/calming-creek
(Besides, it is a pure coincidence that I picked the same title font as "The Curse of Rabenstein".)
Although I am currently busy in the process of making a new game, I was also wondering if I perhaps could port "The Dark Secret of Calming Creek" to the C64 using your engine, but if you really enjoy porting and you like to do it, be my guest. :)