And your level of reading comprehension is equivalent to that of a pill bug trying to figure out why air is solid when they’re hitting the glass wall of a jar.
“How can we get levels without extra story?”
You had one extra step to follow in your thought process in order to find the solution: making the story parts instead of the dark sea, a given if you had read my post.
“Yeah that’s the point 
”
Games are meant to be fun, not time-consuming. If you think the opposite, please go back to counting sheeps, surely you’ll think of it as the greatest game ever thought of.
In conclusion, your statement is like a used paper towel; Nobody is going to touch it unless it’s to put it in a trash bag.