Oh my god.
That was INCREDIBLE. It was small and simple; an interactive story rather than a challenging game, and I absolutely loved how you delivered the end!
Just a few mechanical suggestions, though.
Your crash boxes need a bit of work: I found that I was getting stuck to the sides of boxes and walking on thin air once or twice
Also, you need to make it so that when you're trying to navigate the boxes that fade in and out, you're pushed away from the box instead of getting trapped inside.
And as a purely aesthetic suggestion, add very soft piano music when 'The End' comes up, then fade to black. After it's been black for a few seconds, bring up a replay button.
Get this stuff shiny, and I honestly think this could make front page.