It's a horrible game with no update or balance.
The author just made money selling this incomplete game.
I actually went on speed hack to test the likelyhood of hunting the wild and the result is devastating. 100% for a deer to escape. 
Super Low chance for snake.
You'll die out of water and helicopter don't come at all in the harder mode.
Survived 47 day(more than an hour) camp at lake started moving to other places on day 36. 8 mi travelled died to thirst. And this was the easiest mode in swamp. The balance is just bad. The game mechanism is incomplete. Don't waste your time.