refund from iPhone app store

Not at this point, no.

A trial period (~2 hours?) for all apps would be great. I would try and likely buy a lot more apps than I currently do.

Nope. On android you get fifteen minutes.

As I understand it,you can request a refund if an app doesn't live up to its description or if you accidentally bought it by clicking in the wrong place in iTunes.

I don't think "did not like" will be enough of a reason though.

accidental purchase is the reason when you are GRANTED refund.

in other cases iTunes doesn't refund mostly