Is it difficult to build an app to run on 3.1.3 ?

I'm currently having a strategy game app built and the programmer is telling me that I can't develop an app that will run on the earlier iOS versions.
He cites the fact that apple want people to upgrade and won't allow apps for earlier systems.
I run and test apps on 3.1.3 and have just tested the NEW Angry Birds Seasons and a smaller app called Flow which run perfectly well on 3.1.3.
I want people with earlier devices to be able to play the game.
Is it really difficult to build an app to run on 3.1.3 and will apple block the app from being released if it doesn't conform?
Couldn't put the Product in the list for this thread because it only goes down to 3G ;-)
Thanks
PM

Thanks Michael
I was hoping that would be the case.
I am not a developer, just a designer so this may not be an easy question to answer, but how much 'extra' code would be required to make a app run on an older iOS - roughly how many hours, or would that be dependent on the complexity of the app?

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