Good day! I liked the novella, but there is still something to work on.
Plot events sometimes precede small ones. For example, with Kate: after Kate completes her line with the university, she changes and ignores the main character. But at the same time, there are a lot of small events where she continues to behave as if there were no events at the university.
It is worth establishing a chain of events so that each plot event occurs only after the necessary small ones, which are connected with other characters, have been completed. Otherwise, it turns out to be a mess: and all the characters demand to be moved to their worlds on the same day.