neosapian: yes you heard it right! 30 days!
This is where you mentioned 30 days, in such a manner that it was interpreted how it was interpreted.
Most here are reacting to what seems a sense of entitlement on your part, one we don't agree with because you played the game for more than two hours. Sure GOG don't specifically mention a timeframe, but one should be reasonable about such. They do state not using a Refund as a kind of Review if you don't like the game.
In any case, GOG also need to make things clearer by defining them. Played does not necessarily mean Completed, but it can be taken that way.
While we don't know what you paid for the game, it seems pretty clear you were engaged enough by it and got enough back from it to play it more than two hours. Some suspect you got your money's worth, especially as it is noted as being a short game. Being upset at the Brevity is a pretty clear indicator you were enjoying it enough to want more.
Sometimes I eat a meal, and think that was great, there should have been more. I don't ask for a refund though, because there wasn't more.