Coop is something that we have investigated and decided to put to one side. We don't currently have any plans to add it to the game now or in the future.
Well, just think about this. With Coop I would convince my friends to buy the game , and they would convince their friends to buy the game and so on... so they can play together.
This way , I`m playing the game, my friend is not that interested .... but he would be for coop
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It can be made easily from my point of view. when I want to engage in a battle , if my friend is not in a mission , to be able to invite him and start the battle together if he accepts. Nothing complicated.
Thank you.