Sekiro is one of my favorites. I like that it's not really about leveling, and it pretty much gets right into it. I could pick it up today and blast through a new game.
Do you know how to do the lightning reversal? There are a handful of bosses that it really counters.
You have to jump when you're doing it, too. if you touch the ground before it finishes, it won't work and you'll just get shocked.
If you clear some post-game optional challenges, there's a special move you can unlock that does it easier, but that's only useful if you want to do NG+
Hours on the centipede man, you say? Once you get into the deflect rhythm, they're very satisfying. Fill their posture right up and then finish them. But without the timing, you're going to take a lot of chip damage or get posture broken yourself :(