I’m not entirely sure. It doesn’t give me any error aside from a generic ”The application could not be opened.” It may have to do with Catalina getting rid of 32-bit support but not sure.
Viewing post in ADLENGINE - Roleplay / Text Adventure Engine comments
Oh wait ok so I made progress. I was experiencing the same issue with Catlateral Damage, and the dev suggested I try extracting from the zip using "The Unarchiver" instead of the built-in archive utility, and that worked! I tried it with ADLENGINE and it now recognizes it as runnable app, but it gives me a new error when I try to run. Looks like it's crashing. Added the crash logs to a pastebin: