Code
Envy Labs has designed their site using a grid layout with many divs. Much of their site is also designed to be animated or responsive in some way. The HTML code is very minimal. Most of the work is acomplished by the styling of the pages. Much of this I don't really understand. When you look at the sources there are layers and layers of folders. It looks like much of it is Javascript. I think this is probably because of the responsive nature of the elements on the page.
User Interface - UI
At first blush, the site looks very minimalistic. Clean lines and a soft mint tone make the page very subdued in appearance. The font is basic and graphics and design of the page is very linear. Once the user begins to move around the page, the look changes as the design and graphics change and respond to the users interactions. The responsive action of the page still keeps the origional appearance of clean lines, linear composition, and subdued tones.
User Experience - UX
The user experience is enhanced by the responsive styling of the page. The navagation is easy, and is aided by a floating icon that indicates where you are on the site. The minimalist design while being easy to navigate does not inherantly make me feel as if this company is very creative or outside-the box thinking. If I were looking for creative solutions for my web applications, I might not get that impression looking at this page. If it weren't for the responsiveness as I navigate through the pages, I would find the site boring.
Summary
If you only relied on the appearance and user experience, I would not find this site to be overly interesting. While the responsiveness is to be applauded, it lacks in keeping my interest. However, the clean lines and linear design appeal to me very much. I like a minimalist approach to web design. I think the minimalist design though combined with the subdued color scheme might be too simplistic. The code however does impress me. Just like the design of the page, the code in HTML is very straight forward and clean. The linear grid layout separated into divs it easy to follow and understand. The real technical expertise, at least from my limited perspective, seems to come from the responsive styling layered in the folder system and controlled with Javascript.