I created this today and think it may be helpful to others. Ive fine tuned it to be functional, intuitive and efficient and hope others can enjoy it too!
Downloadable 34kb .html file, runs in chrome, saves and loads in .json
https://wishiwasalemon.itch.io/puzzle-dependency-chart
Hope this is allowed. Not a sales gimmick, just a totally free tool for designing your point and click adventure games!
Cheers!