I'm still thinking through on how I can expand on those ideas and turn them into a full 20-level chapter.
This is my problem. I have a bunch of neat one-off ideas, but I want to make a full chapter. I don't want to just string 20 random levels together; I want some cohesion. But at the same time, it's difficult to stretch one unifying idea out over 20 levels.
I might get stuck making mini chapters, or even 3-level "warp zones".