I just purchase this game and the Mac download isn't compatible. so a little bit of false advertising... 

it works for me can you send the error meessage somtimes with apple there are issues with perms

The application “ROB 0.3.3 Untamed - Mac” can’t be opened.

there is no code that is supplied. Just the above text.

try right clicking on application then pressing open if that doesn't work try xattr -cr"drag your app next to the command"  on console https://www.youtube.com/watch?v=6fqzb4qpgcs is a detailed guide on how to do it  if neither of those work check your Mac version sometimes games that work for certain versions don't work for others because of apple changing security around