I don't know if you showcase high scores, but here's mine on each difficulty setting from Version 1.7: https://imgur.com/a/sd8U9xC
I recall cheating a little, but I didn't cheat to survive any of the fights. Not even against the Mancubi-like monsters in the last level on Psychotic. Jesus, their fireballs are so fast...
My only critique is that the final boss is the exact same on all difficulty settings, though that could of been intentional.