Still Life for Mac was working on MacOS Sierra 10.12, but stopped working after upgrade to MacOS Mojave 10.14.1. Removing and reinstalling the game didn't help.
I contacted the support and this was the answer:
"Please try changing the version of Wineskin and Wine engine. To do this you will need to install Wineskin Winery from here: http://wineskin.urgesoftware.com/tiki-index.php?page=Downloads
Start the application and use it to download additional versions of Wine (by clicking +).
Now you should be able to right click the game's app, select Show Package Contents and run Wineskin.app.
If the Wineskin.app is not there go to Contents > Resources > game, right-click the game's app select Show Package Contents and open Wineskin.app.
In the Advanced options change the engine to the one you have downloaded."
For me it worked. I hope this helps you.