Try this
sudo chmod a+x Terra\ Nil.app/Contents/MacOS/TerraNil
Maybe try this? It seems to be a permissions issue with the ZIP
For Mac users who’ve downloaded an .app, you’ll need to do a bit of Terminal maintenance. Right-click the .app, navigate to /Contents/MacOS, and find the single Unix executable file. Open a terminal window and type in “chmod +x “, then drag in the Unix executable. You should wind up something that looks like this:
chmod +x /Users/UserName/Downloads/Terra Nil.app/Contents/MacOS/TerraNil
Hit enter, you should see the icon change, and your .app should be good to go!
Did it several time, tried running the terminal from different folders, it always, however says:
usage: chmod [-fhv] [-R [-H | -L | -P]] [-a | +a | =a [i][# [ n]]] mode|entry file ...
chmod [-fhv] [-R [-H | -L | -P]] [-E | -C | -N | -i | -I] file ...
And the file icon doesn't change, it remains blank. Btw it previously asked for my password, now it doesn't. Maybe i should do something with the .zip itself? Dunno.
Love ya! Thanks, that helped! The OS still didn't wanna open the app as it is from an unauthorized publisher ( :-D ) and may contain malware, but this time I just allowed the app to open anyway in Security General Settings and it finally ran!) Thanks a lot for the effort, I'm sure others will also find this useful. I'm off to finally play your game) May the Force be with you!