A long time ago I was thinking about this and how if you could better visualise the relationships between functions/modules, it would be clearer to see where there are issues with coupling and cohesion. I think for the most part it could look fairly clean with nice heirarchical relationships, but then the links to common utility files could get a bit messy.

I took a stab at implementing it in Love2d but didn't get far before getting distracted with UI design/development: https://i.imgur.com/kznL4.jpg