Co-Optimus reports that the Sattelite Reign devs are adding a four play coop mode to the game:

Satellite Reign is Adding 4 Player Co-Op, We Have the Developer Interview

[...]

Co-Optimus: What led to the decision to add co-op to Satellite Reign?

Chris: Co-op was an easy choice. We actually had this planned from the very beginning. One of our Kickstarter stretch goals, that we unfortunately didn't reach, was to include co-op. We have had a lot of people ask us along the way if we would include co-op but we had to be realistic about the costs of including it in the initial release. 

Co-Optimus: Will it be a whole new campaign? Separate missions? Or will the main campaign be modified to support co-op?

Chris: The entire game was built with the plan to add co-op at the end. Because of this we made sure that nearly every aspect of the game would be able to be played with multiple players. The only restriction (which we have in the original release) is that each agent must be in the same district. Aside from that, you can do what you want. We were testing the other day where we broke up into pairs to try and run through a few compounds. It does make things much more difficult but it is completely up to the players how they want to play.

[...]

Thanks Eye!