I can't tell you how great the experience was! The one minor UX issue (and its more of a feeling than anything else) is the controls at the bottom. It just kinda feels like I can't see something. maybe the actual controls are too close to the bottom of the page (maybe its my monitor), who knows.
Really glad you are enjoying it. Are you talking about the toolbar auto-hiding? That was a decision we went back and forth on, so I would imagine it is not set in stone. Would you prefer it expanded at all times?
But the experience was excellent!