Amazing
The first time I played I hated it. But the second time I realized it's greatness. I survived 20 days. My review will not be as good as others but I tried.
To make it better
1)Replay value. It is fun all the time, but you need to be able to keep your weapons when you are done. That would be great. It would help some of us see all the weapons.
2) Upgrades for the base and survivors. Not too much, just a few things here and there.
3)Save. That would be nice.
Overall, 2 and 3 are less important. I would like to see 1, but others may not. Great game.