I see the issue. You need to extract the .zip file using The Unarchiver, or it will not work.
It seems like you were attempting to extract the .app directory.
found the problem, also found a solution, when downloading something through safari, when that file is downloaded its auto extracted, which in some cases can corrupt the download, it then dumps the zip into the bin, what you need to do is delete that extracted file, and move the zip from the bin back into downloads and extract it manually, you'll see that when you extract it manually the icon should be a vial with some pink fluid, theirs nothing wrong with the game, its something about apple