Apocalypse PvE

This is mostly completed and will stay this way forever, as I believe there is always room for improvement =]. If you'll kindly give me some hints on how to improve this, that would be nice. This is my first map that I am going to upload, but not the first I have made! This is a player versus enemy map, designed to be played by one person. When you spawn, please enter the labyrinth of strings to go to spawn. Also, set it to hard when you get to the room (you'll know what I mean when you're there).
Want food? What are you, weak? Zombies exist for a reason you know!

--RULES--

1) Don't Break Blocks
2) Don't Place Blocks
3) Turn Explosions Off (If Possible)
4) Play On Hard
5) Never Let It Turn Daytime
6) Don't Exploit Bugs And Glitches
7) HAVE FUN! =]

--INSTALL--

1) Download the file
2) Open with WinRar or 7zip
3) Open %appdata% using the run function
4) Open the "saves" folder
5) Drag and drop the folder from the file into the save folder
6) Load Minecraft
7) Play!