Despite being featured on the cover art I forgot about the big ape and it took my by surprise once it appeared :D
The game is a super crazy chaos at times and it took me a while to get a grasp on it, but it was a fun and challenging experience. I really liked the different weapon types and the constant switching kept things interesting, although I felt like the AI is really overpowered with its accuracy at times. It took my a good while to do any real damage as the zombies.
Also on a side note, the first time a zombie pulled out a gun a laughed hard and it reminded me of this meme a lot: