Time to completion: 20-30 minutes
You play Jack, whose girlfriend Elizabeth has left for Mars for a position teaching anthropology. Constrained by cost, the only means of communication you have with her are the letters, and each takes three months to arrive. Three months is a long time...
The gameplay reminded me of First Draft of the Revolution, with the epistolary format and the way branching is achieved. 13 Minutes of Light introduces a wider story arc of political unrest and social inequality to contextualise the relationship, contrasting the content of the letters with snippets from a mockup of Reddit's /r/mars.
I particularly liked Elizabeth's development from anthropology graduate to (Spoiler - click to show)political leader. This game also plays on the uncertainty and tension that comes with such a restricted form of communication as letters: how do you know what the other party really means?
There are some bits which could have been improved to make 13 Minutes of Light more enjoyable, one of which was a feedback system I didn't understand. The game tells you which parts of the letter go off well, which don't and which are mysteriously relevant to the story. This felt out of place with the theme, given that we are told (repeatedly) how long letters take to be delivered - and whose point of view are these from, anyway?
13 Minutes of Light could maybe stand to be aesthetically more pleasing, but it still represents a solid example of epistolary branching IF.