I'm going to ignore the passive-aggressive statements that come from frustration and give some suggestions. =)
But first, caveat: I don't run the Mac OSX version, so if that annoys you, perhaps my suggestions are not applicable.
Check out the unix_notes.txt file. I think the reason why its not working is because you're attempting to run the executable outside of its directory. So, to actually run it, I would suggest doing something like:
imac-2:~ tim$ cd /Users/tim/Desktop/AliensRL/aliensrl
imac-2:~/Desktop/AliensRL/aliensrl tim$ ./abrl(I am, of course, simulating your prompt here.)
Try that first and let me know if that helps you run the game.