Steam Subscriber Agreement has been updated , looks like EU customers getting an ability to refund the games within 14 days.
IF YOU ARE AN EU SUBSCRIBER, YOU HAVE THE RIGHT TO WITHDRAW FROM A PURCHASE TRANSACTION FOR DIGITAL CONTENT WITHOUT CHARGE AND WITHOUT GIVING ANY REASON FOR A DURATION OF FOURTEEN DAYS OR UNTIL VALVE’S PERFORMANCE OF ITS OBLIGATIONS HAS BEGUN WITH YOUR PRIOR EXPRESS CONSENT AND YOUR ACKNOWLEDGMENT THAT YOU THEREBY LOSE YOUR RIGHT OF WITHDRAWAL, WHICHEVER HAPPENS SOONER. THEREFORE, YOU WILL BE INFORMED DURING THE CHECKOUT PROCESS WHEN OUR PERFORMANCE STARTS AND ASKED TO PROVIDE YOUR PRIOR EXPRESS CONSENT TO THE PURCHASE BEING FINAL.