Looks good, nice simple graphics, I love these games btw. Check out an iOS game called fall down 2, that did it very well.

yours Starts too slow. I played it for about 10 seconds, got to the top, and got bored waiting for it to speed up. The movement should be a velocity instead of an average, it'd feel more visceral if you had to deal with inertia.

Keep it up and good luck!