Pixel Gun on PC

The only way to play PG3D on a PC is with an Android emulator, a good one is "NOX App player", there's also "Droid4x" of which i haven't tried.
there's a keyboard mapping option on NOX which allows you to bind keyboard keys to a specific task and lock your cursor to aim the way you would on a PC first person shooter
hope this helps (If you'd like a good tutorial on how to play and set up your game, click here
But the problem is... I don't think it would be the best to play those on PC. You might wanna have to careful on what you're downloading because it could possibly give you a virus but if you really wanted to play a game on PC, go ahead. I don't mind about it.
Yes, bluestacks emulator, lets you install and run pixel gun on your PC
If your pc have high configuration then only you will enjoy the fun of this game. So i would suggest play this game on your android device only.