We also did extensive narration in our game but we tried to give the player a visual cue in the form of a whitened screen to denote that he will regain control when the screen returns to normal so rest assured - here it's like "ugh get on with it let me run around, I see the level and I know what I want to do!" Other than that thought, super neat idea and could have lots of opportunities for fun trickery. FYI it seems to have frozen on me in browser when I died.