whitebox goods have set plenty of precedents for such reasoning - if it works as advertised, then you can't return it simply because you didn't like what it did (or its looks etc, or that it didn't fit your cabinet/spacing etc). It has to be defective, or didn't perform the full range of functions that is advertised.
For a video game, i'd assume that as long as the game ran (no crashing etc), and the game has all the elements that is advertised, you can't return it for a refund.
A good example was no man's sky. I would say it's refund-worthy, since they advertised that it is possible to multiplayer, and meet other people.