A remarkably beautiful game with controls that feel great. My only gripes with it are rather minor, but include:
There are a bunch of sections (especially the escape sections) where unless you already know what's coming up, you just don't have enough time to react before a death trap.
Occasionally it's hard to discern what is a backdrop, foreground or an actual object you can interact with, which at one occasion made me jump onto a platform that wasn't really a platform.
* The game ends a bit too early, and I didn't really feel like I had explored everything yet.

But don't let those criticism stop you from playing this game. It's a great metroidvania and it's really, really beautiful.