Do you know wether people from Portugal react negatively on brazilian portuguese? I have sticked to brazilian portuguese, as we get much more downlads from Portugal than Brazil.
long answer: Most Portuguese users under 30 years old can read and write, at least, basic english, and would prefer to use the english version of your app instead of brazilian portuguese. This is the scenario that I experience with people around me, at least.
People who are not so comfortable with english will _endure_ the brazilian portuguese if you provide no alternative.