Rosetta
Rosetta is a dynamic binary translator developed by Apple Inc. for macOS, an application compatibility layer between different instruction set architectures. It enables a transition to newer hardware, by automatically translating software. The name is a reference to the Rosetta Stone, the artifact which enabled translation of Egyptian hieroglyphs.
How to use with the game
You need to first locate your intruder installation. The easiest route is through steam, right clicking on the intruder application and going to the sub-menu "Manage" and then "Browse local files" will get you to the apps' folder.
Once there, right click on the application, go down to "more info" and select "Open using rosetta"
Note: If the Rosetta option is not there, you're probably selecting the shortcut.