Ask HN: please review my project (just a demo for now)

My wife and I have started working on an online Russian alphabet tutorial (азбука). It is heavily inspired by StarFall.com and a kids' alphabet book/method called Azbuka Zhukova.The site demo for the first letter is located at:

http://azbuka.heroku.com

We would love to read your comments/suggestions. The site works best in firefox; there's also sound, so make sure your speakers are on if you want to hear it.