Im very happy with the app and with how the slides come out but I do have a few suggestions. First, the picture gallery at the bottom of the screen is a nice idea but it does come in the way. It also looks like its cluttering the screen. Could you add a feature to hide it? Like just swiping down would hide it, and when you need it you simply swipe up.
ZBrang about FunSlides - Make HD video from photos