This is the limit for a no-questions-asked refund that is automatically available.
If you run into a bigger issue you can contact support.
There was once a case where a supposedly multi-level game contained only one unbeatable level that seemed like it was supposed to waste over 2 hours to lock you out of refund. Valve made that game refundable at any time and now it's off Steam (at least I can't find it, the developer said it was the wrong build but I'm quite skeptical at this point)[0].
Of course Steam support is total hit and miss, i.e. I once reported an error on their website (I got "An error occurred while processing your request." in the store + some long GUID so I reported it to them) and I got told to check if my internet connection is okay which is fucking ridiculous.
But if it blows up on social media and in news (like [0] did) or there is legal threat (like with this article linked here or soon with CS:GO gambling, maybe) then they take action.
[0] - https://www.vg247.com/2015/08/07/amazingly-broken-steam-game...