I like the plugin, so here's my list of suggestions for a next release:
1. Plugin menu: after you install the plugin I see no menu to set up some stuff - actually there's nothing to set up yet :P but downhere is a list of things that would be useful to add:
2. Option to set up a default width / height for videos: since the videos doesn't seems to show if you don't set up width and height in shortcode it will be nice to set up a default width + height to apply when no size is specified through shortcode.
3. Option to set up preview image and a default preview image: it would be great to have the option to set an image to appear before the video loads as I i've seen the JS plugin supports that.
4. And also another great thing to add, to show more videos with a single piece of shortcode.
Hope it helps.