Patch 2.1

Patch 2.1 is out now

Fixed size of frostbite effect for giant zombie type
Fixed probem with low drop rate of permanent bonus card
Fixed invalid calculation of "no damage" reward
Difficulty level menu available by default now
Tweaked difficulty curve
Decreased number of kill reqauired for the "Endless Horde" achievement (from 100000 to 20000)
Other minor fixes and improvements