in order to change the quality of this game, right-click where it says "NinjaKiwi" at the top in black, in the small menu that will pop up next to your mouse there will be an option saying "quality" (if not, try again), there will be three options, low, medium, and high. if your computer is running very slow, choose low. if your computer is running OK choose medium, and so on. if you choose low, the visual will be less amazing but will definitely make a difference in speed.
if you start playing story mode and press pause 15 seconds into it and then go to menu, press the mute button and turn it back on after 3 seconds. then go to loots and if you did it right the same song you hear will overlap with the same song so it turns into a "symphony".
if you are parachuting over a large hole, and lose your parachute(or are to low to the ground press F(original slide button, did not test with custom keys)your guy will jump up higher than normal and it might save you from dying.