Ahoi,

There are a few things that I wanted to point out and that was...

1. Does it really need to be in flash?
It seems to me that the only reason for having Flash is the movement of the buttons around the screen during transitions. Perhaps exploiting more of Flash's animation and scripting qualities would be worthwhile.

2. Please do something about the green bars.
This is a point where I agree with Endstand, the bars feel a little out of place.

3. Consider your target audience.
It seems that the majority of your audience would be elementary/primary school based and I think it's worth remembering that not everyone will be able to access the site.