hmm, seems a lot of people are rating the game 1 just because they can't figure out how to run the damn thing. There should be a way for the developers to rescind unfairly negative reviews, I think.
I have a non-jailbroken, 2.2 phone, and ran it just fine when I installed it from iTunes. I couldn't install it from the app store on the iPhone, but that's probably because it wanted more space free on the phone before trying an over-the-air download of that size.
It is a great game, and as a potential iPhone developer myself, excites me to see this caliber of game out already after just half a year of the iPhone platform being opened. I am wary about the ability for a few bad apples to spoil the bunch in the reviews section, but I'm guessing that in light of how easy it is to rate something 1 star instead of trying to get it to work, most smart people will probably disregard ratings and give it a fair shake.