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I think you just ask for it

u need to play less than 2 hours, then it needs to be bought less than 14 days ago, and then you need to send a ticket, idk where is the button for that, or maybe just from support section.

http://store.steampowered.com/steam_refunds

http://i.gyazo.com/02db294d3149be78b4123af1fe56558d.png

To the right of each game says "Support" click there and there you go (In mine says Soporte because spanish)

EDIT: Well you figured it out fast.

http://store.steampowered.com/steam_refunds

also you should wait about a week untill they will make moneyback

just got email like this 'Your purchase has been returned. Refunds may take up to 7 days.'