Cthulu is the preeminent character in the Cthulu Mythos created by H.P. Lovecraft. He has an octopus head, scaly skin, claws on his hands and feet, and small wings on his back. He's hundreds of feet tall. There is a lot of artwork of him so you can get an idea of what he looks like.
A spaceship has crashed somewhere near your village. It contained the spider queen. She has been out at night spreading her eggs (spawners) in an attempt to take over the planet. You must battle your way through several villages and rid them of the infernal eggs as well as avoid the queen's traps. Finally, you must journey to the ship, parkour to the entrance, destroy the queen (a giant wool spider that you must burn) and her nest (of spawners).
How about a Chose Your Own Adventure map. You make your choice and enter a room. You could face a spawner, lava shower, parkour map, ect. After each feat, you face three doors to choose from.
A spaceship has crashed somewhere near your village. It contained the spider queen. She has been out at night spreading her eggs (spawners) in an attempt to take over the planet. You must battle your way through several villages and rid them of the infernal eggs as well as avoid the queen's traps. Finally, you must journey to the ship, parkour to the entrance, destroy the queen (a giant wool spider that you must burn) and her nest (of spawners).
How about a series of sky islands connected with parkour obstacles. The rule being you can't add blocks to the parkour course. Each island has different survival materials.
I don't know if this is what your looking for. I looked at what you have done, but I've never done a challenge map myself.
The very first time I spawned, I fell into an ocean. At that point, I didn't know how to swim. So, I kept trying to jump up blocks and get out of the water. I kept dying, respawning, falling into the water, and then dying again. I finally went out and created another world.