This thing was good, but lower the spawn rate a bit, because with the new update, the skeletons become absoultely lethal and destroy the game's fun, and try spawning mobs out of dispenser instead in the dark so you don't have to worry about creepers and stuff, and so you have complete control over the game... :D

Good work, dude. Lot of fun, and quite a bit of re playability. A few problems though;
1. The armour should drop a lot less frequently, depending on the difficulty, On Easy, your inventory fills up so quickly with armour you're not gonna use. (A suggestion, maybe, with the introduction of command blocks, you could give the player new armour directly, or simply build a in-map disposal system just a thought).
2. Food could drop, maybe fairly often on easy, and getting less frequent on the higher difficulties. And maybe, depending on how long the Player survives, you can give them food which will sustain them longer.
Those are my problems, but otherwise, maps really enjoyable, I can see a lot of work went into it. :)
Have a diamond for your efforts, good sir!