Very tricky... It's fun, but it has some problems... Okay, first, you shouldn't send out your people until you click "end day", because twice I sent out everyone for scavenging (food supply is low because I can't make a kitchen), then I noticed in the corner, "RAID!" Oh great. We're dead. Feels like a waste because I couldn't do anything. By doing this, you can take them in and out if you change your mind. Very important.
Another problem that should be fixed is the grammar. Just saying, you would sound a bit more professional if you use better grammar and spelling.
Also on my mind (now I'm getting this from Rebuild), I'm curious if adding zombie-killing missions would help, to make a zone temporarily safer. Not sure if anyone agrees.
I found that my friends are fairly likely to not return from a mission when there's low danger. I mean that three or four times in the short time I've been playing this, I've lost people when the mission had a 4% to 9% danger. Does this have to do with health? I guess that's what the next suggestion's for...
Tutorials. I figured it out, but lost most of my friends in the process, and reset. Don't forget pro-tips! You have to spend I good time thinking about these and skimming through reviews to know what common misunderstandings or mistakes tend to be made.
Those are the only things bothering me at the moment. If I come up with more, I'll PM you.