Great. The summary I took home and added to my Anki deck (kind of TLDR):

Gamification works if

• Each item's score reflects how valuable is in the long run.
• Partial completion should give partial points
• Reversing should cancel points (otherwise: cycles of repeated falling back)
• All paths should result in the same points (thus: reward state transitions instead of actions)

I thought most about this:

For instance, rewarding yourself 100 times as much for working 100% on a project than for working on it 50% might lead you to complete the project early at the expense of your health, your friendships, your education, and all your other projects.

This kind of assumes that all these other aspects also get scores - otherwise by definition these are less rewarding. I'm wondering whether it is a good idea to have a diverse set of things that get scored (kind of along the line of rewarding complexity of human value). But I also wonder whether this takes focus out of the system. And working focussed on one specific topic is more efficient than spreading out ones energy. I wonder whether this can be priced in somehow or implies a certain minimum size of an item.