Gotcha, it´s tough. Did not do many first person things myself and this was meant to be feedback for further production or something. I can´t put it into words either but I would guess that you can´t feel the weight of the character and the movement speed might be a bit to fast (I always struggle with the relation between size and movement speed of a character myself). And than maybe some breathing or a idle thingy for the camera. Something like that... ?