Over on his YouTube channel, Charlie Cade argues that what defines game as a unique medium at its very core is challenge, and that game creators and critics would be wise to be aware of that:

As a new fresh medium we can make up our own rules. We can a look at the type of art we’re making and decide what gives it its intrinsic value. […] Shouldn’t you entice new people with what the medium can do differently, rather than by trying to make it more like everything else?

Check out the full video: https://www.youtube.com/watch?v=uoOK6e_y1q8

In terms of further reading, you may also be interested in this article or this piece of the BrainGoodGames commandments.