It works in the same exact way, you just need to change 3 commands (since 2 file/directory names change).
Step 2: type "cd ~/Desktop/Mac.app/Contents/MacOS", then press enter.
Step 3: now type "chmod +x Farty\ Rocket", press enter.
Step 4: Finally type "./Farty\ Rocket", press enter.
All the other steps are the same as Karlson (remember to move the game .app onto the desktop before doing anything). After doing this once it will open just by double clicking.
If you don't know what those steps are, refer to the previous reply with that sort of little "tutorial" that I made.