Little lacking, but the substance is there.
An interesting submission. I like the feel to it, but for a game over theme it is a little too light. Other than that, it has a good flow and is patched together exquisitely.
If you have the time, I would like to see a re-sub of this that has been extended a little further. While this is good for five seconds, I have the lurking suspition that if it were extended, even by two seconds, it would be perfect.
Ways to improve: (Five Second:) Nothing to improve upon other than how light it is. It has more of a heroic discovery sound to it, where as game over is more of a tragedy.
(Extended Version:) I would suggest adding something to the very end after the horns. Be it a bell or drum; this loop gives me the feeling that it needs something to take advantage of the energy being built up by the end. Something that can clearly signal the end.
Keep up the work,
-RSC