Thanks for the feedback and I am glad you'll use it for teaching (which was the main goal of this project)! The padding part it's briefly explained on the "dynamic" notes on the left column, but yes, can be improved. Typing on the input gives you some sense of what is doing on the background, specially if it jumps to two blocks.

The "for each chunk" is also implemented (which was one of the most difficult parts to synchronize with the UI), but I agree too, I should come up with some way to represent it better. Thanks again :)