Loom
How to run on macOS 10.15 Catalina
This game has two parts to it: the data files and the engine. Unfortunately, the engine is not compatible with macOS 10.15 Catalina since it can only run 64-bit apps, but the engine is 32-bit.

Fortunately, you can use ScummVM[www.scummvm.org], which is an open-source engine that can run the data files from this game and many other old-school adventure games. Follow these instructions[gaming.stackexchange.com] to get the Steam release imported into ScummVM.