If you bought this through steam, standard refund, provided you have played less than two hours, within 14 days of date purchase, have been described.
But that is not the only way. If you have bought this through steam, you can create a manual request (the first type is pretty much automated). Be warned that this process does not increase your chances to get refund but provided you manage to argument your case in an adult and serious manner (like a lawyer). Stay away from conspiracies and anything you objectively cannot prove. Also they will most likely refuse you if all your arguments are purely that you are dissatisfied with GUI or that NPC AI is not up to your standards. THEY WILL ALSO refuse you if you abuse refund policies (ask for refunds all the time). Finally don't expect refund directly to your bank account/Paypal/Whatever but rather to your steam credit.
- Go to your account purchases (or latest activies) via Help -> Steam Support in steam client.
- Find the date you purchased EDO (or choose EDO from your latest activities)
- Click "I have a question about this purchase"
- Fill in the form indicating you are requesting a refund and that the automated system is rejecting the refund and that Steam is counting playing hours when launcher window is up and not game process.