Got it and really into it so far. It's dragged me away from Dust. In many aspects, it's more metroidy than a lot of games that get called metroidvanias. Right now, I am semi-completely lost in what to do and I have a big interconnected map of places to go with some idea of direction, and lots of shortcuts between areas.
So far only two of the orb puzzles have stumped me. I'm at a point right after you spoiler (click to show/hide)
see the mask
and I may have gone the wrong way after that, but I doubt the game would have such an easy way to screw yourself over. I do have an area I can access once I have 60 orbs, but I'm only at like 35 right now.
One other thing: I really love how they did zero-gravity in the game.
Ending:
spoiler (click to show/hide)
I swapped at the end, did either of you guys choose to stay behind? Does it even matter[/existential]
Actually, I found a Youtube video of the other ending. Neither ending is especially fulfilling. Also, I wish I had played with subtitles on, because sometimes it was hard to understand what was being said. I think I got most of it, though.