I can't beat mission 8. With endless troops swarming me from the start of the mission I can only survive a few seconds. Maybe I'm doing it wrong I dono.
Glad you got through! You didn't miss anything, that keycode door and computer are just cosmetic, so I might remove them in order not to confuse/distract players. The plot is linear by the time you've reached this late stage of the game, so don't worry about missing anything else