All of you complaining about ending not being in the topic title need to think twice before clicking on something that says SPOILERS...twice in fact. If you don't want to be spoiled then don't click on spoiler topics until you finish the game.
I usually only play RTS games for the single player. They have done so much to try and get people into the multiplayer this time around that I really want to give it a shot but it is kind of daunting getting into all this build order stuff. If anyone has some really good sites or other resources that would really rock.
There is actually one more after that one. Go all the way to the right of the light and climb down and you can keep going. Drop down over another part after you see the egg and pull out a box then drop back inside.
My interpirtation is similar. I think they boy and girll were playing the in the tree house above them that you see. The boy and girl fell out and died. You must reunite with her to find your way back to heaven.
Someone on the GameFAQs boards I was talkiing with said he thought it may be the same thing but a car crash instead. I had to really consider that when you consider all the elements in the game. A fly on the windshield, a spider on the dash, a car wreck causing tearing and scraping metal (buzz saws), crashing though the final pane of "glass" at the end.
My interpretation was that a boy and his sister were playing in their tree house when somehow they fell out and died. The boy and girl are in purgatory and he must reunite with her to find his way to heaven.