But I don't get paid to tell you to download stuff.... actually, I don't get paid at all, but that's beside the point. No, I get not-paid to review games, and I'm here to you: download this: it is not a waste of time.
NinJump is a vertical scroller like so many others we've seen, but this one actually has a bit of character and style to it. Your little Ninja is climbing a building, and jumping from side-to-side to a) avoid being killed by obstacles and b) slash stuff (birds, squirrels, throwing stars, and the like).
All you have to do is jump back and forth from wall to wall as your character climbs, and he does the rest. The trick comes from timing his jumps, and the more obstacles you find, the tougher it gets.
This isn't quite as good as Bird Strike, but as vertical scrolling obstacle games go, it's worth every penny.