Had to take a little break. I've just now started facing actual threats but I've spent over an hour just in the introductory level alone. Even tiny details are given an insane amount of care. Index's pressure-sensitive controllers mean you can crush cans. Pick up a matchbox, jostle it, hear the sticks rattling around, etc.
Controls are, as expected, janky. There's no jumping. To cross a gap, you "shift" across. When you're done "climbing" a ladder, you let go of all controls and it pops you up to the top. If you're a person who keeps their thumbs on the touchpad of Index controllers, you're going to have an issue accidentally swapping between weapons.
Opinion may change near the end, but it's pretty fun right now.