Thanks for the feedback. I don't mind the 'complaining', definitely more useful than just a generic "Good job".
As for the performance, RX480 should be able to handle it as we've had no performance problems with GTX 770. We'll look into it
I agree with the game-play problems. At the moment the guns are bit weak, which makes it hard to clear enemies properly. Sprinting will either be removed or make shooting more inaccurate. At the moment the main use is to move forward faster so it doesn't take so long to get to the next objective (sprint is not applied when moving backwards).