Fall and it's hell

"You must never fall on that mountain. If you fall, you will be taken to hell by demons." There was a mountain, commonly known as "Korobase-yama" (Fall-Down Mountain), with such a legend.
Inside the mountain lived imps, messengers of hell, who would follow any human they found entering the mountain.
Then, they would chase the human in a group, disappear, approach the human, push them, and cause rockfalls to make the human fall.
Humans whose feet leave the ground, who lose all sense of direction, and whose perception of the boundary between this world and the next becomes blurred are sent to hell.

Needing a large sum of money, you decide to take on a job called "Ura Baito" (underground part-time job).
The job is to "clean the inside of a shrine at the summit of a certain mountain."
And the client tells you:
"No matter what happens, absolutely do not fall on the mountain."
You must complete the job safely and return alive.

==================================
A simple horror-flavored scenario playable in Donald 2.
If the progress to the summit does not increase unnaturally, please manually increase the progress by 10%.