Great job on these. Variety is the spice of life. I think the defense mission needs the Zeds to drop a bit further away. I didn't watch the videos first and was very surprised when they were all around me. Is there a way to have them spawn just outside the POI?
Also, any chance you know how to fix the clear missions so you actually have to clear rooms and not just know where all the zeds are? I think it would be good to have a checkpoint in every room so even if you do the rooms out of the "designed" order, you still know what rooms you have not hit yet.
A clear+building supplies mission would be nice for the early game. could include concrete, cobblestone, storage containers, tools, repair kits, etc. Maybe electrical stuff, but that would be later, T4 or T5 stuff. Also, Clear+clothing/armor.
And I don't know what challenges this would have (coding-wise) but a race mission would be a lot of fun. a series of checkpoints have to be hit in a given time. The starting point is a random distance from the trader (higher levels start further) and there are a ton of zombies at the points making it hard to hit the point. T1 would be possible by foot. T2 by bike. T3 by scooter. T4 and T5 require a motorcycle or 4x4. In all cases, you have to get out and grab a supply crate. Higher tiers also have more checkpoints. Storyline... because the trader made a bet with another trader that their guy could do it faster than the other trader's guy. Maybe add a nighttime only to the higher tiers. why? because bragging rights!