Try it out here, requires a WebGL capable browser. It's a bit buggy, so watch your head.
You can check out the sources on GitHub. What's still missing is making the editor work properly without WebGL DONE (though it's not Mobile Safari -friendly), making the slide editing more efficient, and fixing some markup parser bugs fixed some. At that point it'd be a decent barebones slideshow app. Add themes, fancy filters and animations and stir on low heat.