Hope these are helpful:
- You're missing a favicon - sites always look more professional with one
- Your menu links the home page to 'index.html' instead of just the root '/' - as it is Google will see this as two separate pages
- Your footer invites me to resize the page - but when I do so the design breaks (e.g Home Page) below about 760px wide and above 610px, after which it's OK. Then below about 490px the menu buttons become enormous - for mobiles I assume, but they do seem very large.
The design's nice and modern, goes with the subject matter.