Nice! I'd eliminate the reflection, I was rather confused when I saw a reversed screen. At least add a transparency gradient to it (let me know if you need help). Also, are you selling it while giving away the source code for free, or just haven't updated the site yet?
The ability to focus afterwards is at the tradeoff of image size and quality, assuming they use a microlens array similar to the study located here: http://graphics.stanford.edu/papers/lfcamera/. However, this is cleverly marketed towards the social media crowd, which has little use for high resolution photos.
There's probably great uses for this, such as learning and adding on to other CoffeeScript scripts. I think it's hilarious that Javascript converts to Coffeescript, which then converts to Javascript.