Cool visuals and atmosphere. I liked the inclusion of the secrets, they made me be on the lookout throughout the game and gave me satisfaction when I found them. But that's it.
Some of the puzzles were interesting, but the rest was either too tedious, too easy, or too cryptic to be enjoyable. The story potential was there, just not utilized at all in my opinion, and the ending was dissatisfying.
These "feeling comes first, gameplay comes second" kind of games are not my really my style, I knew that coming in to Limbo and it has been reinforced going out.