OOTP Developments has a 14-day, no questions asked, money-back guarantee on game purchases. This policy only applies to games purchased directly through Out of the Park Developments as explained here. So if you buy the game from the Apple App Store or through Steam or from Amazon, etc., then you'll have to contact those companies to see if you can get a refund. But beware that getting refunds for software purchased through third parties may not always be possible. You might want to contact them first or try a demo first before purchasing through a third party.
Assuming you purchased directly from OOTP Developments, then here's who you'll need to contact for a refund: