I think they just need to flesh out the Eternal Soldier campaign, if they re-did the tutorial and made it an actual mission (as I don't think that tutorial even shows you how Harec plays!) and then added two more missions, maybe to free Alicia and Konstantin? That would give you the first 4 characters and a legit campaign to grind in,
Instead of one mission and whatever one is free that week
I was incentivised to buy the other campaigns because I wanted more content after managing to get 40 hours out of Alien Myths.