The combat system is perfection.

Even on my 3rd playthrough I still felt bursts of dopamine after beating almost every boss because of the always increasing difficulty and opt-in "hard mode" mechanics such as the Kuro's Charm, which encourage you to keep pushing your skills further and further.

Few games will provide an experience as rewarding as deflecting dozens of attacks in a row as you completely dominate a boss and you remember how this game used to kick your ass so hard, back when fighting them for the first time.