Just finished this game in one day, it's very short but not a minute is wasted. The puzzles are fun but sadly not too challenging, I never found myself truly stuck. This helps the flow of the game though, and where the first game felt like it was very much trying to ape playdead's games, but this game has a lot more of its own identity, which ironically brings it closer to the quality of playdead's games.
The enemy designs suffer a lot less from cluttered monster design and goes a lot deeper into the uncanny valley by keeping the enemies more human.
The addition of combat works great and is used very effectively, and really adds to the tension.
Each level feels unique, and giving each level a unique mechanic is inspired.

But let's be honest the big selling point is the art design. I've alluded to it a couple of times and damn is it a step up in this game, which is saying something as it was the highlight of the first game. There's more variety, more restraint and more creativity with every environment, character and setpiece in the game, everything is wonderfully animated and used perfectly.
The structure is also wonderful, balancing chase scenes, puzzles and combat in a perfect way that takes this game from a standard puzzle platformer in gameplay to almost a retro-style survival horror game (even the controls are the same as the original silent hill and resident evil).
This is a game that I can't recommend enough to everyone and is definitely the best game I've played so far this year.

I'm sure that, over time, my opinion of the game will go down as I forget exactly how good this game is, but right now I'm absolutely blown away. I was expecting a step down from an already just ok game, but this not only fixed all my issues, but added several mechanics that create some much needed depth and variety to the gameplay.