It also teaches the user quite a bit about prioritisation, and the fact it's essentially just a graph problem with multiple constraints which can be solved with a variation topological sort shows how useful algorithmic thinking is in daily life!
I can't view the site at the moment due to the HN hug of death, but I do have a question.
You say these are daily puzzles, are they hand curated by yourself or algorithmically generated - or a bit of both?