unexspected but welcome sequel
The traveling concept was a great new edition, it was almost as if it's daring you to take as long a route as possible rather then the safer as few stops as possible method.
Not that anyone should really need advice playing this game, but it's not essential to search every building just the obvious place. To win for sure I guess the order of importance is supplies, defenses, civilians then weapons (for some reason even unarmed civilians fight with some kind of pistol? x.x) and the sooner you find civilians to help you the easier it gets, because then you have waaaay more margin for error (my first play through I got to the end on day 43 due to screwing around and day 35 the 2nd time).
Personal fave weapons were the bow and sawn off shotgun, but when I managed to find 4 other civilians on the first map I was happy just taking out the faster enemies with a chainsaw until I had more weapons to choose from.
All in all it's a strangely addicting concept that the only way you could improve on would be improving the traps and adding more RPG elements, such as different character stats and with that characters working in shifts (anyone who goes 40 days without sleep traveling and stuff would be wasted! x.x) or as already mentioned fights while changing location or if you get to union city early having to help hold off the hardest swarm of enemies until day 40.
SPOILER
You could still base the players progress on how many days it took them to get there, it would just add more gameplay, not to mention lend itself to a better ending then the one it has at the moment. The ending was the only major disappointment, because the only difference between the good and bad ending is seeing union city with or without airstrikes hitting it.