Couple hours in. Fantastic so far and feels like a giant step up from the previous game. Visually and aurally outstanding, the game is legitimately hypnotizing. The level of detail and depth on screen makes it feel like the game is in stereoscopic 3D even though it's not. Combat feels great, hitting with the hammer uppercut is immensely satisfying, I love that if you press it right as a flying enemy starts to charge it'll connect with them with perfect timing. I also like the nuance on the sword, if you hold down and attack on the ground it'll do a thrust that will push enemies, useful for getting them into spikes.
I'm really loving all the little details too. The little Moki cave drawings in the background, the map fragments/stone from Ori 1 that the map guy has covered with his paper maps, the extra animations on Ori like when you dash into a rope/vine he whips around it, etc. There's like a hundred other great things I could say about it already, even stuff like the cinematic intro section at the very beginning is smartly designed to get you quickly used to Ori's base movement and the fact that he has the wall jump from the get go this time around.
Issues wise I'm getting micro stuttering and I had a small cutscene glitch with the second boss. Otherwise it's been running at 110fps+ consistently I think (980ti) but I'll have to check more frequently.