I agree about the box shadow, it’s just too much. Here for example, I see three nested elements with huge shadows and I don’t really know what I’m looking at:
Another suggestion would be to wrap the whole page in a container and give it a max-width and/or some horizontal padding, so the headers(?) like the one labelled “Take quizzes” don’t stretch to the very edge of the page.
Then there’s an issue with the feedback form - when an input gets focus, the surrounding element gets a light background, so I can’t really read anymore what I’m supposed to enter:
And finally, I found the navigation a little confusing. When I click on “play games” from the main page, it leads me to a page where I can pick a game from another menu located at the bottom (which isn’t particularly intuitive, it looks more like a footer, and not all links in that section actually lead to a game), and I have no visual indication anymore in the main nav where I am. This is different behaviour than the other sub pages (like About or Composers). I’d suggest that the “play games” link from the main page directs to something like “resources/#educationalgames”, because that’s where the list of games is.
That’s all the critique I have - keep building and polishing