You make me proud to be a Half-Life fan.
Some people didn't like the fact that the song was from Halo 2, but I don't mind at all. In fact, I'd say it's kind of honoring the song, it went great with the flash too. You should make more flashes in future. Mabye one about Aftermath? Yes, those who don't know, Half-Life 2 Aftermath, and expansion pack leading on moments after the end of Half-Life 2 is on it's way from Valve. As well as Lost Coast, a cut out chapter which is now a level showing off new technologies. Very high system hardware is required to run it though. Don't worry about Aftermath.