Pros:

-Fantastic crossover with Minecraft styled theme; great skins, environment, weapons, items, and cameos from popular Minecraft players.  I love how you transformed Minecraft monsters into the special infected (Chicken witch? Scariest shit ever)
-There's variations between environments and even with the trash zombie hordes.  (Minecraft zombies wearing diamond armor etc)
-No technical issues for me.

Cons:

-Snow at the starting level makes it extremely hard to see and is disorientating (should tone it down a little)
-Some parts may require directions.

Conclusion:

Great attention to level of detail.