Dynamic camera makes you see less in the direction you are going in + when you fall your character can get out of sight, which feels wrong (oh, and camera is zoomed in too much imo). Crawling state makes you smaller, allowes you to climb walls and does not affect speed, so there is no reason to getting out of it (unless you add some enemies or hazards so player can not stick to walls 90% of the time). I have to say though, controls felt smooth and crawling around denying gravity was pretty fun.
(sorry for broken english)