I had seen nothing about the game so it wasn't really on my radar until I watched Giant Bomb's quick-look which sold me instantly and continued to sell me more and more throughout the video. Just a warning though, you may want to skip to the 12 minute mark if you dont want to spoil the "feels" of the prologue.
http://www.giantbomb.com/videos/quick-look-ori-and-the-blind-forest/2300-10005/
I put about 5 hours into it yesterday and am enjoying the hell out of it. Its a really well done metroid-vania that reminds me a lot of Dust An Elysian Tale. I have no intentions on going for all the achievements (some are pretty crazy) but I have been going around and doing a lot of backtracking every time I unlock a new ability.