Taking a look at the Parallels website, it's a virtual machine environment that runs Windows within OS X.
It looks like Parallels uses its own graphics drivers in the virtual machine, and that shouldn't work when running this game. If you want to use the full power of your computer, use Bootcamp instead of Parallels.
That said, the Intel HD 4000 is a non-gaming graphics chipset that falls far below this game's system requirements. Once, just for fun, I tried running the game on Intel HD Graphics 4600 and had to lower the graphics to the absolute minimum and turn down the resolution to 1280 x 720 to get a playable framerate. It was not a pleasant experience.