Minedeas - Hordes

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'You stumble around in the darkness, being chased by who knows how many mobs, trying to find your home.'
"Come on, John! Pick up the pace, or our own demise will surely greet us today."
"I know, I'm trying, but....they're everywhere!"
'As you and the only other survivor of the massacre finally jolt out of the forest, you see your sanctuary: a huge castle with only one way in, and one way out.'
"Man am I glad we put all that work into this."
'You rush inside, donning your armor and collecting your equipment, resetting traps and filling the dispensers, hoping that you have put up enough defenses for the coming onslaught.....'
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Well, as you could see from above this may or may not have anything to do with all hostile mobs.....
My idea was that you could have another game-type called "Hordes". During said game type, after 3 days to prepare, (or, after how many you set it to as an additional option) all the hostile mobs (Except a select few) in the area would march on you at exactly the stroke of midnight, only breaking the siege when daylight comes.
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The only Mobs that would not try to come are the following: Silverfish, Cave spiders. and all nether mobs.
Why? Well, having cave spiders and silverfish come after you would be redundant seeing as they only spawn DEEP underground, and having the nether mobs march on you would be glitchy, UNLESS you had it that they all head to the nearest portal and came from there. (But that may be a bit TOO complicated.) Other than that, all other mobs would walk/crawl/teleport to get at you. (Endermen would also act as if you looked at them) All mobs would still keep their functions and use them to their benefit when trying to reach you. (Zombies would break down doors to get at you, no matter the difficulty, spiders would climb, skeleton would snipe from a farther distance, ect.) Spider Jockeys would also spawn at a much less rare rate than they used to in this game-type.
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I thought that this idea would be great for people who enjoy strategy and love a good challenge, for all it's intents and purposes. It also gives people more to choose from when they open up the game. There is no crafting recipes for this idea, as it would all have to do with mob AIs.
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I would appreciate any feedback on this idea for future idea of my own, and especially now seeing as I haven't gotten any. Any help is sorely needed and welcomed. Thank you for your consideration.