More a script-canvas test, than it is HTML5, although does showcase how canvas can be used as an effective replacement for something previously done in flash. Within header, <a> could be wrapping <h1> and <figure> could be used around image.
<section>’s used ok but <aside> used as a functional, as opposed to informative manner and repeatedly so. A div here would have been better. Really just an experimental site. We look forward to seeing the finished product!