Transitions of the colored blocks/people coming and then going out before another dancer appears would be nice.
Buttons could be a bit fancier.
People/Blocks coming in could use a little more "punch" IMO.
Coming in fast and slowing down slightly or "easing" into their final resting spot would give a more dramatic effect. The "home" and "contact" sections are slower compared to the other ones. I'd make them all about the speed of the "about" section and use 3 blocks on all of them.
Pretty cool but get rid of the music or make it off by default. If someone looking to hire you opens your website in an office and it starts making noise, its quite possible that they'll immediately close it and move to the next one, because it's disrupting the environment.