While Apple does usually give refunds their policy makes it clear they are not obligated too. When requesting a refund I recommend a better excuse than 'I don't like it'. Fails to perform as advertised, crashes all the time, or even purchased by mistake would be better choices. I'm not saying lie, I'm saying don't expect to get a refund for a game because you 'didn't like it'.
Anyway, the better choice is to spend your money wisely, after reading the description and reviews (Google them as well as looking at the ones on the store); and if you are still in doubt try asking (after searching) here to see if anyone else has purchased it and has comments.