Haven't had a chance to read the entire thread. Was this article on Crave already posted? Imagine folks here have likely come up with similar theories, but just thought I'd share.
http://www.craveonline.com/entertai...theory-limbo-sequels-brain-bending-conclusion
Goes a bit into theories of it being set in the same universe as Limbo, who the boy might be, who's controlling who, and so forth.
I particularly enjoyed this bit at the end:
I don't mean to present this as the only plausible theory, just one I found pretty interesting in terms of tying in the name of the game with the notion of 'is the player really in control the game, or is the game controlling the player with this blob symbolizing that connection'.
I've also heard alternate theories about what the 'rebirth' scene that seem just as valid. I also liked this comment from the same article interpreting the entire game a bit more symbolically:
Don't know if I can make an obvious connection between each area of the game correlating to a specific part/system of the body (beyond what was already mentioned), but I like the interpretation nonetheless.
I have to say I enjoyed the ending quite a bit. I don't always appreciate stories that are ambiguous purely for the sake of ambiguity, but I also appreciate when stories leave behind just enough clues to set off all these different theories and discussion of what the story means to them. I love it when literature sparks a discussion about its interpretation and meaning, and it's fantastic when a game is able to create the same sort of curiosity.