Overall, nice work - an improvement on some of your past works. Anyhow, here's how I think you could improve it:
Separate the content from the navigation - at the moment they're bunched together and it looks a little 'squished' if you get me?
Add a logo - If this is your portfolio, let the user know (as if it isn't obvious enough already) make yourself stand out;
Make the boxes the same, at the moment they're different sizes and not aligned properly (or so it seems)
Maybe add some box-shadow to the boxes or even a thin border to make them have a '3d' effect.
Try taking some of the above into consideration and see if you prefer it or not, just a few ideas. Liking that you've included various colours to brighten it up a little more - although I'm not that keen on the orange. Nice work, keep at it.
Edit: if your BG is #000, change it to #222 - little changes can make a big difference. Solid black is horrible