I have played Nioh 1 and completed 2 so I was looking forward to the demo. I was able to give it a whirl over the weekend so here's my thoughts about it.

Overall I found the game to be pretty difficult. It's not clear intuitively how to approach the fights, especially boss fights. I completed the demo yet I have no idea when to be in ninja mode and when to be in samurai mode. For the boss fights I just beat my head against the wall until I won. The full game will be a painful experience for me if I can't get better.

Regarding the ninja/samurai switching, I'm not too excited about it. I don't like the cognitive load of figuring out this system. Maybe if I "get" it at some point I'll have a more positive opinion of it.

The approach to open world is nice. Areas are clearly segmented on the map and each area has a recommended level. So you clear an area and then move on to the next. Clearing an area is pretty straightforward. As you clear, points of interests get marked on the map so there's no need to peer into every nook and cranny.

I might get the game when it goes on sale because I can't find any physically discs in the market.