Jiri, I think you do a good job identifying a need and demonstrating the existence of a receptive market. I think you have a good idea but for someone without experience in this area, it is hard to discern the specifics of how your app stands apart from the field. It is not uncommon for superior technology or products to fall by the wayside while inferior options succeed. While your product appears to be better, I wonder if it is substantially better, to the point where it can unseat more established competitors? If it is vastly superior, it was hard to identify from the presentation. I think the Prezi format made it a bit hard to navigate and an alternate presentation style might have made it easier to get your key points across. I think an expert in this field could better evaluate your app, but the average investor without a solid background might feel a bit lost.
Your idea is innovative, but in my opinion, the Prezi does not do it justice. Too much steak not enough sizzle?