heya, this was created with unreal engine 4.27
to get the lo-fi look I turned off anti-aliasing and set the resolution scale low (so the engine renders the game at a low resolution then scales it to the players screen size - lethal company also does this in unity I think, where the game is always rendered at 640x480 then scaled back up)
for Something In The Well I did something similar, but I think I used some maths so the scaling was relative to the players native resolution and added a post-process effect to pixelate the screen which made the image quality a bit sharper, kind of like using the mosiac filter on a blurry image in photoshop
there's a bit more to it, but tldr: my game looks super low res cause it actually is :-)
hope this helped! lmk if you have any other questions