Hero difficulty is not hard at all.
Simply put - Use Stealth as much as possible.
When in trouble - [ LB ] - web retreat is you friend. - He who fights and runs away, live to fight another day ....
Your health regenerates when not in combat, and even faster when you are not moving - use this to your advantage.
Take your time with the bosses. A few hits in, dodge, retreat, dash in, hit again... rinse and repeat.
Watch out for the lasers from the S01, S02 & S03 machines.
You will have to
time your jumps correctly to avoid them as they are the only things that can damage you badly.
Use web-shooters while jumping and swinging to bring these bots down fast.
This mode will give you good practice for the Super- Hero difficulty.