The gameplay is quite different from anything I've played, yet everything made sense thanks to the pace with which you unlock new mechanics and very readable UI.
The demo felt like it dragged on for a bit too long for the amount of content it has, as in the last weeks there was pretty much nothing to do.
Considering there are lengthy animations for each different kind of training, I assume this game is meant to be played slowly, not just speeding through every week. With that in mind, I feel like 12 weeks might be too long between missions. Also, it does not really feel like you are seeing your recruits improve and then finally triumph in the mission, because you were never able to interact with the "mission" type of gameplay until the mission itself. To fix both of these issues, I would argue that adding some kind of a "mock mission" after 6 weeks could help.
Overall, very interesting concept that has a unique appeal.