About the controls... I've tried both the control schemes and yeah, it is easier to control with the d-pad scheme.. but I figure the devs wouldn't have made the 'mos' scheme the default for no reason. The game moves really fast so with onscreen d-pad my fat fingers cover a bit more of the screen than I'd like.
So I'm sticking with 'mos' controls. After some practice I've become quite good at them, though there's lots of room to improve. I do like a control scheme that makes you work hard to master it

You sort of have to use your brain in a different way than usual in a platformer.. almost like a dual stick shooter or something..
The way how if you're holding 'jump' while in the air you'll jump as soon as you hit the ground, makes for some really intricate timing things you can do to shave bits off your time.. hard to explain.. but it's like you can get ready to jump before you even hit the ground, so you can land super close to enemies and jump over them in the nick of time. And minutely changing the timing of when you press can drastically affect what happens.. This is all very satisfying when running at high speed without stopping.
[edit: oh yeah, another good thing bout the 'mos' control scheme is that it works perfectly at 2x on iPad, where onscren d-pad would become too spaced out... not that this will matter when the game becomes universal..]