!!! SPOILER ALERT !!!
At first, the game seemed a bit suspicious to me. Although I've played almost every major Souls-like game, I hadn't heard much about Sekiro.

The new combat system, the new way of killing enemies, and even the story are absolutely incomparable to conventional Souls-like games. However, I quickly reached the final boss and thought before facing him that the game was actually too easy. I massively underestimated it. The final boss is on a completely different level, incomparable to the rest of the game. I spent nearly 30 hours in the game, and I'm sure I spent 5-7 hours just on Isshin Ashina.

This elevated the game to a whole new level because Mikiri counters and similar tactics weren't as prevalent before this fight. You really have to take the time to understand the mechanics and how to counter, just to have a sliver of hope of getting in a free hit.

Furthermore, the boss fight is absolutely brilliantly designed. The map alone is extremely epic (except for the rocks that just block you and get in the way), and the four phases of the fight keep you constantly on your toes.

At first, I thought I would never be able to do it, but with time and nearly 120 deaths just to Isshin Ashina alone, I think I can say that you can flawless everything except the 2nd phase of Isshin without being a pro player.

Also, the concept of the boss is extremely cool.

You've returned to the story where it all began. Getting Genichiro down is doable and a good warm-up, BUT

Then this old guy crawls out of his corpse, he's on a completely different level. He throws in a couple of unblockable attacks, and he has a cool weapon combat art. If you somehow make it to phase 2, then he pulls a gun out of his ass and a gigantic spear (I don't know where he got that from), and if somehow you manage to survive through all of that, then you're onto phase 3 and he's roasting your face with lightning bolts. You think it's impossible, you've used all your consumables, but believe me, it's possible even without all that stuff.

I know there are different endings with different bosses, and I'm excited to see what comes next and looking forward to more boss fights like this in any games