It's the song
I've noticed that many flashes just get good reviews because someone can sync an animation to a well-liked crazy song. You definitely put a lot of effort into this but effort isn't everything. Sometimes there is just pointless blood and when the refrain comes around you just reuse the same stuff without adding anything new. Even just a different sign in the background would have been good enough for me. Yes, I am being picky but that's necessary to do when something makes it into the top 50 of all time.