Thanks, @Get_DOVAH_it ! Glad you liked it. 
Progression is going to be linear in the first run. After that players will be able to revisit any level with different modifiers.
Model 75 is a military unit who was trained prior to this event for situations like assassination and crowd control. With this incident however the training program restarted by itself and is malfunctioning so it will be an unusual training sim this time!