I had to put it down to the easiest difficulty to beet the queen of the valkyrie - that was TOUGH!!On PS4 Pro I played it on Hard and completed the entire game and every side mission, except the final Valkarie.
It was only then I realised you can change the difficulty with no penalty what so ever, including trophies.
My advice - play on the standard difficulty...
How anyone can play these sort of games with mouse and keyboard is beyond me... Nutters.