Note: A very slightly extended version - with larger images and a few of Dutton's explanatory quotes - is up at my personal blog.
In 2009, aesthetician Denis Dutton wrote The Art Instinct. There, aiming for something inclusive and objective, he outlined twelve cross-cultural criteria for art. I like Dutton for his mix of accessibility and intellect, so use his criteria as a starting line in the search for a language of the aesthetic experience.
1. Direct Pleasure
2. Skill & Virtuosity
4. Novelty & Creativity
7. Special Focus
8. Expressive Individuality
9. Emotional Saturation
10. Intellectual Challenge
11. Art Traditions & Institutions
12. Imaginative Experience
That’s how some games are already art, and how others might get better.