I'm not seeing much talk on GB other than the Quick Look. Alex did fine (okay, he missed some important stuff he should've seen/got), but this game is far more than that Quick Look might've made it seem.
This game is massive, absolutely overflowing with secrets and juicy bites of lore, stuffed full of varying collectibles ranging from huge gameplay tweaks to awarding the player a shower of gifts, and painted over with sweet strokes of gameplay ingenuity that add hours of replayability to areas already visited.
And I haven't even beaten it yet (no spoilers please).
Put simply, this is a lengthy, full, juicy, immensely satisfying experience. I'd only warn not to be thrown by the drab color palette; it's going to be mostly shades of blue, but it serves the greater purpose of world cohesiveness, and even then there's still plenty of variety in each of the many different hand-drawn environments. Buy this game.