Hey ben, nice demo, regardless of it working or not on other platforms.

I'd be interested in your feedback on why you used binary images and avoided jQuery. I know the code makes notes on these, but were you actually already experiencing loading issues without using those techniques?

In other words, was it to practice using the techniques or were you already hitting visible loading delays each time you started the app?

Also, you mention using ems for layout to handle resizing on the github info page, I've not heard of this technique, any chance you have a link explaining it?