You're too hard on yourself bud. Don't worry, this flash is excellent! Amazing really, watched it a few times already due to the animation and how well it slides with the beat. That lead singing zombie, the fella in the purple was well animated (Facial features, the way he was dressed) Really made you see him as the lead. Everything was great in detail, stuck to the beat, and was interesting the whole way through.
Your score is very high, you should be proud, atm i'm seeing a 4.67 and that is just incredibly high.
You did well bud, Good job.