Hello,
the game is not working out of the box on Pop! OS 22.04 LTS, and probably other Ubuntu based distros.

The error message is:
Running My Brother Rabbit PL
./MyBrotherRabbit_amd64: error while loading shared libraries: libidn.so.11: cannot open shared object file: No such file or directory

the below command fixed the issue:
sudo ln -s /usr/lib/x86_64-linux-gnu/libidn.so.12 /usr/lib/x86_64-linux-gnu/libidn.so.11

I am experiencing this issue with Nightmares from the Deep: The Cursed Heart. From the same publisher.

Too bad there is no solution as of yet