Perhaps unsurprisingly, the Reddit and Discord communities are full of people asking if anyone's successfully convinced Steam to give them a refund. While anyone with less than two hours on the clock should get one automatically, those with more time are having mixed results, with some reporting success, others being denied, and the rest asked to wait while Steam "investigates" the issue. 

The most successful requests seem to be via human checks, so players are suggesting that those looking for a refund should not check the box to "request a refund," but instead contact Steam via the "I have a question about this product" option. That way, your request will be routed to a member of customer support, and not an automated service.