I'll see if i can find something.

Update: as far as i can see, the Windows Version is a 64-bit binary.
Which leads me to believe that the Mac-Version is the same, and therefore should not be blocked by Catalina's lack of 32-bit application support.
Ill investigate further, but it would be neat if you can provide any extra information. E.g. there should be a log file called tljh.log somewhere (on windows it's in the games Appdata-Folder, i am not that knowledgeable on the Mac stuff). Also, can you please post your hardware info (especially graphics card?). Did the game work on the same machine with a previous OS version?