Huge balance overhaul

Before this update there was too much ammo, too much time, enemies were too weak and player was too strong. And I am happy to announce that this ends now! 

Starting ammo decreased from 100 to 50.

Ammo pickup now gives 5 bullets instead of 25.

Time limit is 2 minutes now, instead of 3.

Enemies deal 10 damage instead of 5.

Now JungleFever plays like something with actual challenge! Enjoy!

P.S. Also shooting works a lot better!