This indicator is great. I appreciate that it's able to be minimized and then moved around! It's like a drag and drop button; very cool.
One feature which I thought could be improved was how many checklist items that it would support. I have modified it to support 40 checklist items - twice as many.
It would be nice to be able to modify the color scheme.
Even better would be if it could allow additional columns to be added and a customizable header for each. So that a user could create a checklist with more than one checkbox per item. Unfortunately this is beyond my abilities to code! I am still learning.
I have attached my 40 item version; it has worked during my testing.