Great job on the release! Looks nice, although I would definitely recommend adding a tilt mode after trying it a few times. I found that my thumb really gets in the way of the screen and blocks off 40% of the play area (common iOS pitfall). Other than that, it plays nice, definitely fun.
Also #1 ranked arcade, come at me
Ask RandomityGuy about floating point, bonus points if you tell him "x87".
Or even an option for a static control mech instead of the dynamic one. It's definitely going to take some getting used to. I keep intuitively tapping the coordinate location of the vector I want to travel on. Instead you have to actually draw the vectors manually. The manual drawing often throws me off when I want to make sharp ninja turns. I have to redraw the opposite vector to do so, which means moving my finger a long distance, and often right into the middle of the screen.
Other than the controls it definitely looks nice on my phone. Very crisp and simple.
EDIT: hey, what about airplane controls! Keep a static zero point in the center, but then make the ship fly in the reverse direction of the finger! That eliminates the visibility issue!
As it stands now I find it easier to fly using a single index finger in a corner like the joystick technique employed by some games.