I've been aching for another Rebuild-style game and you've definitely done it, but there are a few problems holding your game back from greatness.
1. Grammar. The ideas the text is trying to get across are conveyed poorly. Try proofreading or getting someone else to help you out. I'd be glad to send you corrections if you want.
2. Unnecessary features. The postscript of scavenge reports that say "WE MANAGE TO HELP THE TWO GUYS" is really useless when you consider that the two guys you supposedly helped weren't grateful enough to join you. Also, the missions where I need to retrieve large equipment (generator and hospital so far) shouldn't make me take people from guard duty just to conveniently have my base ransacked. When a mission like that is taken on, a minimum number of people sent should be set from the beginning. They already know they're going to get this equipment, why the hell didn't they go prepared? The RPG elements also seem really tacked-on. I shouldn't have to precisely follow 20+ survivor's stats so I can get them just right. It's really time-consuming, comes off as purely asthetic and isn't all that rewarding
3. Inherent unfairness. Branching from the ridiculous add-ons at the end of missions where you're retrieving equipment, I sent the group with a 0% risk. Why doesn't that mean that I sent enough people to handle any threats they encounter? If the survivors I sent met allies at their destination, how exactly did they get outnumbered if they already prepared for that kind of risk beforehand? The happiness cap is kinda dumb but I suppose post-zombie apocalypse survivors can only be so happy.
tl;dr Please make grammar and simplicity tweaks to make a good game a great one.