Empire Total War on the Macbook Air 2012?

[Maximus]

I received the new Macbook Air for Christmas, and I was wondering if I would be able to play the Empire Total War available through the app store, as there is no CD drive. I also intend to buy an external hard drive. Here are the specifications for my Mac:

1.8GHz dual-core Intel Core i5 (Turbo Boost up to 2.8GHz) with 3MB shared L3 cache
128GB flash storage
8GB of 1600MHz DDR3L onboard memory
Intel HD Graphics 4000

I have the latest OS X. Empire Total War is listed at 11.97 GB (I am not sure exactly what that means, as I am not a tech person). Will I be able to play, most importantly save, the downloaded version on my computer?