Ninja Gaiden 3: Razor's Edge

Yeah, the name is rather stupid. Hero mode is practically easy mode. Damage doesn't matter AT ALL. Once you get to critical health, you get auto block / dodge, making you virtually invincible to everything, including bosses. The only thing that can kill you is insta-death stuff, like failing a QTE or something. It's somewhat pointless, because all you have to do is just all-out attack, but it's good if you wanna get used to the control first. Keep in mind, you should get used to dying though.
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Thanks. Way back in the day some games would only let you get so far on easy mode before you had to start all over on normal if you wanted to see the end of the game. Can I go through the entire game on Hero?