I was a bit lost too in the beginning. That reminded me of a hint that got a few years back from a teacher about presentations: "First tell the audience what you are about to tell them, then tell them and finally tell them what you just told them. Use slides to support your speech not vice versa - You want the audience to listen, not read."

I'm also thinking that the presentation is too heavy for a 30 minute time slot. May be you could shorten the beginning of the presentation? Don't get me wrong the presentation is good but it needs to loose some weight.

Looking forward in seeing this presentation live.