Arrow Keys to Move. Move in 8 directions with acceleration and deceleration. Bounce off of walls according to the rate of speed. Can get real close to walls. Minor glitch: if keep pushing into walls, may get stuck, in which case just tap toward or away from the wall and you'll get unstuck.
@MabonBaladevaKain This is closer but still not even near-perfect as I've seen it be in other klik-style apps. I'll keep probing Scratch's abilities and maybe come up with something even better hopefully. Stay Tuned!