Dilatedness and interestingness are spectra not binaries yet I can only find their usage in "is" above distinctly binary.

Then it follows: Experience is a series of dilations.

The quote describes games as its interesting decisions rather than defined by them.

Games are full of uninteresting moments and nondecisions but Meier elides these as nonexistent.

"Games are a series of interesting decisions"

Interestingness is effectively synonymous with dilation and comes with all its baggage.

That answer is ontologically and semantically unclear to me but as dilation determines how we experience experiences it plays a pivotal role if not the superlatively most role.

Does dilation act upon experience, or produce it?

We may be able to find a more precise understanding of this dilation through analysis, but it will remain true throughout that process, exclusively, determines the dilation.

In collaborative storytelling we collaborators decide how the story dilates: why do some events take months to tell, and others minutes?

Art dilates, governed by process.

A work of art dilates according to its artist's or artists' process.

Dilated experience is experienced more and though there are many comparative adjectives we might suggest (greater, richer, catchier, stronger, heavier, larger, better) moreness answers for them all perfectly without any unnecessarily exhaustive list.

The sole salient feature of all such qualities is their dilating effect upon experience therefore I name this quality synecdochally after its solitary object: Dilation.

Unlike (the common picture of) reality experience dilates according to some nameless quality experienced by its experiencer.

Thanks to Sam and Julia:
Sam for bringing up the idea in the first place, Julia for dragging me into it.
I am no academic, so I won't attempt the rational style.