I don't know if this has been suggested before... but I think it would be very useful if we could see enemies/bosses on the radar. I think this could be very useful, ESPECIALLY when you are fighting Vanaduke because he will randomly charge and catch you off guard without notice. I know that for bosses, it might be a bit controversial cause I know there's no point in having a radar for Roar Twins because you can see them on screen. But in general, including enemies/bosses in the radar could improve some aspects of the game.
You would not include some enemies though like chromalisks (they are supposed to be invisible) and maybe not phantoms ( ghosts would not show up) And graveyards in general would not work ( graveyards are unnatural, therefore the radar should blank out most of the time or the image would be blurry.)