Yes, you can request for a full refund, but it is not directly available in the app store.
How to get a refund using iTunes
- Launch iTunes on either your Mac or Windows PC.
- Click on your name at the top and in the dropdown select Account Info.
- Type in your password when prompted in order to proceed.
- Click on See All under your Purchase History.
- Click on the arrow next to the purchase batch that contains the purchase you'd like a refund for.
- Click on Report a Problem next to the single purchase you'd like a refund for, unless there is only one, then you may use the large Report a Problem button.
- You will be routed to Apple's website. Just follow the steps after signing in and request the Refund option and explain why.
See: http://www.imore.com/how-to-get-refund-itunes-app-store