[ ] Might want to get rid of those borders on the buttons, they look like the default browser ones.
[ ] The homepage with the scroll-triggered elements, only animate them once as it'll be annoying to the user if they keep animating when they're scrolling back up or looking for certain pieces of content.
[ ] Site strapline is a little close to the bottom of the header bar, just needs moving up a little
[ ] Site title and strapline are both in h1 elements, can mess up SEO but not a major issue
[ ] Search field in the sidebar nav doesn't tell me what to do after typing my search term in? Probably need a submit button or something to tell the user how to search
[ ] Search results page is missing a main wrapper
[ ] Even though there's an indication to a link on portfolio items, you can only see it by clicking the 'full' button
[ ] After closing the projects the tab animation breaks and sits in the wrong position
[ ] Send button on contact page touches the footer
Just some suggestions on improving: