Interesting list- a lot of great points.

Two minor pedantic observations: (0) I think adding lots of divergent colors should only be done to serve a purpose. In this case, imo the color palette used does not complement the numbering and appears to be used solely to distinguish different heuristics- for which there is no real need.

(1) Also (and this is even more minor), going down from #1 to #2 trains the reader to keep going down but #3 is to the right of #2 making it needlessly disorienting.