I've run into a pretty significant problem (for me): On ultrawide (21:9) displays, the game is zoomed in to fill the entire screen. This cuts off the top and bottom of the game which, aside from not looking right, hides the trap doors off screen and makes them virtually invisible. I'm pretty sure there's a way to force UE to render a fixed aspect ratio with black bars on the side, though I don't know what it is off the top of my head.