First, this looks great. I'm usually not really into cutout/paperdoll-types of animations, but you've got some good seams and most of your pieces blend together nicely.
There are two things I've run into while testing you demo. If you run backwards (aiming in the direction opposite of where you're moving) and roll, the animation for the roll doesn't flip and it looks a bit weird. It probably has to do with mouse position, and adding a backwards roll might be something to consider.
The other thing I found is more of a bug. If you do a roll down into a pit and hit the wall 'before' you land, you get stuck. The only way to get unstuck is to spawn an exploding bug to "help" you get unstuck.
I don't really agree with the key placement argument as I don't have a problem with the layout, although double-tap would probably work better than Ctrl for rolling.
Imho, Up (or in this case W) should never be used for jumping unless you are making a fighting game. But seeing as you were gonna use it for climbing you've got that part covered already
Keep on truckin'!