GoF2 is an interesting time killer, but only on your phone or tablet. On the PC it falls short in nearly all aspects. OK, you can set high resolutions, but textures and models are still very low quality. Sound? Music - atrocious BGM. Voice - medicore at best, but passable, sometimes even funny. But leave it for a second, because special FX isnt that important when gameplay is great. But its not in this case. Controls are horrible. For example flying is most accurate on mouse. When using joy/gamepad its just too sensitive and its really hard to aim. When drilling - use gamepad (not bad X360 pad support), because its nearly impossible to control it using the keyboard. So you will be forced to use 3 different controllers. Story - nothing special, but it justifies all the shooting and exploring. But when on the phone all that exploration and barter feels like "a lot of content" on PC is like a neverending chore, boring and tiring.
I could recommend this game only as a bargain bin purchase for 1 buck. In other cases you will feel like ripped off, because the boredom will quickly get to you. But dont get me wrong - its not a bad game. Its just not a good one.