It is, basically, a Spider-Man game. No, of course it's not called that, and (after a recent update) the main character is no longer clad in Spidey's trademark red and blue, but there's no doubt that the game's trying to simulate the feeling of tooling about as the world's favorite wall-crawler.
So, why is it great for iPhone? Well, it makes good use of the touch screen for starters. But, far more importantly, you can have a complete experience in under a minute thanks to the game's inherent design and quick loading.
So, if you're making an iPhone game of your own, remember this simple formula: "Spider-Man - the color red + quick games + a $0.99 asking price = A really easy recommendation."
Rope 'n' Fly Lite (Free):
Rope 'n' Fly ($0.99):