Hey Guys.. So if you're having issues with Mac, try this? As I read comments and tried their suggestions too but sadly it didn't work for me. But this did.
Try opening the downloaded game, (Mac Ver.) then allow it to be opened. The icon on the bottom where your dock is, should pop up but then disappear.
Then move the game out of the folder and put it on your desktop. Once there, use the terminal to open it with (xattr cr-) then drag the game into the terminal then enter. (Try opening it then but if it doesn't work then keep reading).
After using the terminal to try and open it, drag the game back into the original folder with all the files and then try opening it there.
That's what worked for me, hopefully it'll work for other people too.